BleepingComputer.com: Windows Update will not update (error code 80070490)

I didn't see any posts about this, so I hope I am not double posting.

After removing a drive load of viruses, I am still not able to update Windows Vista to Service Pack 1. I have even tried to create a new admin user account in hopes that this would work, but no go. I tried running sfc.exe / scannow from the CMD and it did report that it was unable to repair wextract.exe. Also, the file reportingevents.txt located in %system root%\windows\softwaredistribution\reportingevents.txt lists "Windows Update Client failed to detect with error 0x80070490".
Although, I think Windows Defender can update. I need to take a break.

Acer Extensa 4620-4605
Windows Vista 32-bit Home Premium

This post has been edited by jimbywonga: 15 April 2009 - 12:17 AM