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Criticism of Windows XP deals with issues with security, performance and the presence ofproduct activation errors that are specific to theMicrosoftoperating systemWindows XP.

Windows XP has been criticized for its vulnerabilities due tobuffer overflows and its susceptibility tomalware such asviruses,trojan horses, andworms. Nicholas Petreley forThe Register notes that "Windows XP was the first version of Windows to reflect a serious effort to isolate users from the system, so that users each have their own private files and limited system privileges."^[1] However, users by default receive an administrator account that provides unrestricted access to the underpinnings of the system. If the administrator's account is compromised, there is no limit to the control that can be asserted over the PC. Windows XP Home Edition also lacks the ability to administer security policies and denies access to the Local Users and Groups utility.

Microsoft stated that the release of security patches is often what causes the spread of exploits against those very same flaws, ascrackers figure out what problems the patches fix and then launch attacks against unpatched systems. For example, in August 2003 theBlaster worm exploited a vulnerability present in every unpatched installation of Windows XP, and was capable of compromising a system even without user action. In May 2004 theSasser worm spread by using a buffer overflow in a remote service present on every installation. Patches to prevent both of these well-known worms had already been released by Microsoft. Increasingly widespread use of Service Pack 2 and greater use of personal firewalls may also contribute to making worms like these less common.^[2]

Many attacks against Windows XP systems come in the form oftrojan horse e-mail attachments which contain worms. A user who opens the attachment can unknowingly infect their own computer, which may then e-mail the worm to more people. Notable worms of this sort that have infected Windows XP systems includeMydoom,Netsky andBagle. To discourage users from running such programs, Service Pack 2 includes the Attachment Execution Service which records the origin of files downloaded with Internet Explorer or received as an attachment in Outlook Express. If a user tries to run a program downloaded from an untrusted security zone, Windows XP with Service Pack 2 will prompt the user with a warning.

Spyware andadware are a continuing problem on Windows XP and other versions of Windows. Spyware is also a concern for Microsoft with regard to service pack updates; Barry Goff, a group product manager at Microsoft, said some spyware could cause computers to freeze up upon installation of Service Pack 2.^[3] In January 2005, Microsoft released a free beta version ofWindows Defender which removes some spyware and adware from computers.

Windows XP offers some useful security benefits, such asWindows Update, which can be set to install security patches automatically, and a built-in firewall. If a user doesn't install the updates for a long time after the Windows Update icon is displayed in the toolbar, Windows will automatically install them and restart the computer on its own. This can lead to the loss of unsaved data if the user is away from the computer when the updates are installed. Service Pack 2 enables the firewall by default. It also adds increased memory protection to let the operating system take advantage of newNo eXecute technology built intoCPUs such as theAMD64. This allows Windows XP to prevent some buffer overflow exploits.

On April 8, 2014, extended support of Windows XP ended. As this means that security vulnerabilities are no longer patched, the general advice given by both Microsoft and security specialists is to no longer use Windows XP.

In light of theUnited States v. Microsoft Corp. case which resulted in Microsoft being convicted for illegally abusing its operating system monopoly to overwhelm competition in other markets, Windows XP has drawn fire for integrating user applications such asWindows Media Player andWindows Messenger into the operating system, as well as for its close ties to the Windows Live ID (nowMicrosoft account) service.^{[citation needed]}

In 2001, ProComp – a group including several of Microsoft's rivals, includingOracle,Sun, andNetscape – claimed that the bundling and distribution of Windows Media Player in Windows XP was a continuance of Microsoft'santicompetitive behavior^[4] and that the integration of Windows Live ID (at the time Microsoft Passport) into Windows XP was a further example of Microsoft attempting to gain a monopoly inweb services.^[5] Both of these claims were rebutted by the Association for Competitive Technology (ACT) and theComputing Technology Industry Association (CompTIA), both partially funded by Microsoft.^[6][7] The battle being fought byfronts for each side was the subject of a heated exchange between Oracle'sLarry Ellison and Microsoft'sBill Gates.^[8]

Microsoft responded on its "Freedom to Innovate" web site,^[9] pointing out that in earlier versions of Windows, Microsoft had integrated tools such asdisk defragmenters, graphicalfile managers, andTCP/IP stacks, and there had been no protest that Microsoft was being anti-competitive. Microsoft asserted that these tools had moved from special to general usage and therefore belonged in its operating system.

To avoid the possibility of an injunction, which might have delayed the release of Windows XP, Microsoft changed its licensing terms to allow PC manufacturers to hide access to Internet Explorer (but not remove it). Competitors dismissed this as a trivial gesture.^[10] Later, Microsoft released a utility as part of Service Pack 1 (SP1) which allows icons and other links to bundled software such as Internet Explorer, Windows Media Player, andWindows Messenger (not to be confused with the similar-namedWindows Live Messenger, formerlyMSN Messenger) to be removed. The components themselves remain in the system; Microsoft maintains that they are necessary for key Windows functionality (such as the HTML Help system and Windows desktop), and that removing them completely may result in unwanted consequences. One critic, Shane Brooks, has argued that Internet Explorer could be removed without adverse effects, as demonstrated with his productXPLite.^[11] Dino Nuhagic created hisnLite software to remove many components from XP prior to installation of the product.^[12]

In addition, in the first release of Windows XP, the "Buy Music Online" feature always used Microsoft's Internet Explorer rather than any otherweb browser that the user may have set as their default. Under pressure from theUnited States Department of Justice, Microsoft released a patch in early 2004, which corrected the problem.^[13]

Migrating fromWindows 9x to XP can be an issue for users dependent uponMS-DOS. Although XP comes with the ability to run DOS programs in avirtual DOS machine, it still has trouble running many old DOS programs. This is largely because it is aWindows NT system and does not use DOS as a base OS, and because the Windows NT architecture is different from Windows 9x.^[14] Some DOS programs that cannot run natively on XP, notably programs that rely on direct access to hardware, can be run inemulators, such asDOSBox orvirtual machines, likeVMware,Virtual PC, orVirtualBox. This also applies to programs that only require direct access to certain common emulated hardware components, like memory, keyboard, graphics cards, and serial ports. With DOS emulators, 32-bit versions of Windows XP can run almost any program designed for any previous Microsoft operating system. Only 64-bit versions of XP have major backward-compatibility issues. This is because old 16-bit Windows programs require a tool called NTVDM, which is only present in the 32-bit version of the OS. However, this is true of every version of Windows that comes in both 32-bit and 64-bit versions, and it is not specific to XP; additionally, virtual machine software such as VirtualBox can run 16-bit DOS and Windows programs even on 64-bit versions of Windows.

In an attempt to reduce piracy, Microsoft introduced product activation in Windows XP. Activation required the computer or the user to activate with Microsoft (either online or over the phone) within a certain amount of time in order to continue using the operating system. If the user's computer system ever changes — for example, if two or more relevant components of the computer itself are upgraded — Windows will return to the unactivated state and will need to be activated again within a defined grace period. If a user tried to reactivate too frequently, the system will refuse to activate online. The user must then contact Microsoft by telephone to obtain a new activation code.

However, activation only applied to retail and "system builder" (intended for use by small local PC builders) copies of Windows. "Royalty OEM" (used by large PC vendors) copies are instead locked to a special signature in the machine'sBIOS (and will demand activation if moved to a system whose motherboard does not have the signature) and volume license copies do not require activation at all. This led to pirates simply using volume license copies withvolume license keys that were widely distributed on the Internet.

In addition to activation, Windows XP service packs will refuse to install on Windows XP systems withproduct keys known to be widely used in unauthorized installations. These product keys are either intended for use with one copy (for retail and system builder), for one OEM (for BIOS locked copies) or to one company (for volume license copies) and are included with the product. However a number of volume license product keys (which as mentioned above avoid the need for activation) were posted on the Internet and were then used for a large number of unauthorized installations. The service packs contain a list of these keys and will not update copies of Windows XP that use them.

Microsoft developed a new key verification engine for Windows XP Service Pack 2 that could detect illicit keys, even those that had never been used before. After an outcry from security consultants who feared that denying security updates to illegal installations of Windows XP would have wide-ranging consequences even for legal owners, Microsoft elected to disable the new key verification engine. Service Pack 2 only checks for the same small list of commonly used keys as Service Pack 1. This means that while Service Pack 2 will not install on copies of Windows XP which use the older set of copied keys, those who use keys which have been posted more recently may be able to update their systems.

To try to curb piracy based on leaked or generated volume license keys, Microsoft introduced Windows Genuine Advantage (WGA). WGA comprises two parts: a verification tool which must be used to get certain downloads from Microsoft, and a user notification system. WGA integration with Windows itself was followed by verification systems during installation ofInternet Explorer 7,Windows Media Player 11,Windows Defender,Microsoft Office 2007, and certain other updates. In late 2007, Microsoft removed the WGA verification from the installer for Internet Explorer 7, saying that the purpose of the change was to make IE7 available to all Windows users.^[15][16]

If the license key is judged to not be genuine, WGA displays anag screen at regular intervals asking the user to buy a license from Microsoft.^[17] In addition, the user's access to Windows Update is restricted to critical security updates, and as such, new features and other Microsoft products will no longer be able to be downloaded or installed.

On August 26, 2008, Microsoft released an update to the WGA activation program that displays a plain black desktop background for computers failing validation. The background can be changed, but reverts after 1 hour.^[17]

Common criticisms of WGA have included its description as a "Critical Security Update", causing Automatic Updates to download it without user intervention on default settings, its behavior compared tospyware of "phoning home" to Microsoft every time the computer is connected to the Internet, the failure to inform end users what exactly WGA would do once installed (rectified by a 2006 update),^[18] the failure to provide a proper uninstallation method during beta testing (users were given manual removal instructions that did not work with the final build),^[17] and its sensitivity to hardware changes which cause repeated need for reactivation in the hands of some developers. Also if the user has no connection to the Internet or a phone, it will be difficult to activate it normally.

Strictly speaking, neither the download nor the install of the Notifications is mandatory; the user can change their Automatic Update settings to allow them to choose what updates may be downloaded for installation. If the update is already downloaded, the user can choose not to accept the supplemental EULA provided for the Notifications. In both cases, the user can also request that the update not be presented again. Newer Critical Security Updates may still be installed with the update hidden. However this setting will only have effect on the existing version of Notifications, so it can appear again as a new version. In 2006, California resident Brian Johnson attempted to bring aclass action lawsuit against Microsoft, on grounds that Windows Genuine Advantage Notifications violated the spyware laws in the state;^[19] the lawsuit was dismissed in 2010.^[20]

Windows XP's default theme,Luna, was criticized by some users for its childish look.^[21][22]

• Criticism of Microsoft
• Criticism of Internet Explorer
• Criticism of Windows Vista
• Criticism of Windows 10
• Free Software Foundation anti-Windows campaigns
• Windows refund

External videos
Is Windows XP Good Enough?,Microsoft

• Windows XP
• Microsoft criticisms and controversies
• Operating system criticisms

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