Microsoft is planning to patch 4 Critical bugs in various OS as part of their "Patch Tuesday" on July 13, 2010. The critical bugs affect Windows XP, Windows 7, Windows Server 2003, Windows Server 2008, Microsoft Office 2003 and Outlook 2002 through Outlook 2007.
Most of the patches will fix critical remote code execution in the above listed software and are recommended updates. The critical fixes will be available through Windows Update and may require system restarts.
The Windows 7 patch is for systems running 64 bit version. You can view the entire security bulletin and affected software and vulnerability by visiting this link.