I just noticed this same update is repeating today in updates:

"" Update for Windows 7 for x64-based Systems (KB976902)

Download size: 10.2 MB

You may need to restart your computer for this update to take effect.

Update type: Important

Install this update to enable future updates to install successfully on all editions of Windows 7 or Windows Server 2008 R2. This update may be required before selected future updates can be installed. After you install this item, it cannot be removed.

More information:
http://support.microsoft.com/kb/976902

Help and Support:
http://support.microsoft.com ""

I downloaded it last time without thinking much about it until I saw this post and some discussions, and now they want me to download it again.

http://www.pcworld.com/article/209868/windows_update_comes_with_extras_you_may_not_want.html?tk=hp_new

http://www.computerworld.com/s/article/9195079/Rival_calls_foul_over_Microsoft_s_delivering_Security_Essentials_via_Windows_Update

http://www.networkworld.com/community/node/68113

Microsoft responds to Windows Update flack
Says KB 976902 update pulled to add more infomation ??

http://support.microsoft.com/kb/976902

Windows 7 and Windows Server 2008 "Applies to" section. This software update will be a prerequisite to install service packs.

Update removal information " You cannot remove this update. " Download size: 10.2 MB

http://www.infoworld.com/t/windows/were-microsoft-you-can-trust-us-566

http://www.wilderssecurity.com/showthread.php?p=1773753

http://www.pcworld.com/article/209292/were_from_microsoftyou_can_trust_us.html