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Microsoft Defender Antivirus (formerly Windows Defender) is an antivirus software component of Microsoft Windows.It was first released as a downloadable free anti-spyware program for Windows XP and was shipped with Windows Vista and Windows 7.
Users may alternatively download the updates manually from the Microsoft Security Portal website. [7] On 30 September 2011, a faulty definition update caused the product to incorrectly tag Google Chrome as malware. The issue was resolved within three hours.
The first version of the antivirus program was basic, had no inbuilt update facility (updates had to be obtained from a BBS and manually installed by the user) and could scan for 1,234 different viruses. [3] Microsoft Anti-Virus for Windows (MWAV), included as part of the package, was a front end that allowed MSAV to run properly on Windows 3.1x.
Windows 95 and Windows NT 4.0 were retroactively given the ability to access the Windows Update website and download updates designed for those operating systems, starting with the release of Internet Explorer 4. The initial focus of Windows Update was free add-ons and new technologies for Windows.
Starting with Windows 10 Creators Update, Microsoft has introduced a new component called Windows Defender Security Center (WDSC) that provides much of the same functionality. This new component is a Universal Windows Platform app and is also the default front-end for Windows Defender. [12] [13] It relies on its own service, called "Windows ...
As far as the integrated Windows Update (WU) function is concerned, Patch Tuesday begins at 10:00 a.m. Pacific Time. [9] Vulnerability information is immediately available in the Security Update Guide. The updates show up in Download Center before they are added to WU, and the KB articles are unlocked later.
This is an accepted version of this page This is the latest accepted revision, reviewed on 2 February 2025. Computer program that modifies other programs to replicate itself and spread Hex dump of the Brain virus, generally regarded as the first computer virus for the IBM Personal Computer (IBM PC) and compatibles A computer virus is a type of malware that, when executed, replicates itself by ...
Active antivirus protection may partially or completely prevent the installation of a major update. Anti-virus software can cause problems during the installation of an operating system upgrade, e.g. when upgrading to a newer version of Windows "in place"—without erasing the previous version of Windows.