working solution for your problem
you may want to try this . as some reg values may be missing
open this link http://www.blackviper.com/Windows_7/Services/Windows_Update.htm http://www.blackviper.com/Windows_7/Services/Windows_Update.htm. down the page you find title
Registry Settings (.reg):
copy text under it into say a text file and change extension to .reg
run the file ,click yes wait confirmation and restart your computer . then check and see if my solution works for you