Try this -
- Click the Start orb, type cmd in the Search all programs and files field, right-click cmd.exe, and then click Run as administrator. Agree to the UAC prompt.
- At the command prompt, type the following commands, and then press ENTER after each one. Please include the spaces as the commands must be exactly as laid out. You can right-click after the Prompt and Paste these in, too :
net stop cryptsvc
ren %systemroot%\system32\catroot2\edb.log *.tst
net start cryptsvc
exit
See if the system can update now. If it still can not, please copy&paste the last 50 or so lines of the WindowsUpdate.log into your reply -
How to read the Windowsupdate.log file
MowGreen Update Services - Consumer Security