Hi Lisa, this fix may help. (from MS Technet)
http://forums.microsoft.com/TechNet/...6997&SiteID=17
1: Open up "Control Panel" and navigate your way to "Programs and Features".
2: Click "View installed updates" on the left hand side.
3: Find the update KB929777 and uninstall it.
4: Attempt to install the update again in Windows Update
5: Once successful, restart your PC.