My last successful update check was September 11, 2012. Some updates installed successfully, others failed. The failed ones were:
Update for Windows 7 (KB2719857) Recommended
Update for Windows 7 (KB2735855) Important
Update for Windows 7 (KB2741355) Recommended
Windows Update now says, "Restart your computer to install important updates." When I do, the computer shuts down, saying "Preparing to configure updates..." When it restarts, it says, "Configuring updates...100% completed..." then restarts again. Upon reaching the welcome screen this time, it says "Failed to configure updates...reverting changes...Welcome" and returns me to my desktop. At this point, when I try to manually check for new updates (or if I just leave Windows Update alone until it checks itself), Windows Update tells me "Restart your computer to install important updates," and the process loops again, so I cannot check for updates.
Things I have tried:
-Manually installing the failed updates (each one tells me that "The update is not applicable to your computer")
-Startup repair (though, I'm having no problems starting up)
-Rebooting in safe mode, then restarting
-Disabling F-Secure firewall and antivirus
-System Restore to a point before these updates were attempted (this resulted in a message saying that System Restore failed, but at the same time, System Restore also presents me the option to undo the System Restore, which also gives me a failure message 0x80071a91)
I've never posted on a help forum like this before, so please be patient and clear with instructions on how to provide any information I need to you!