[polecat69]

Testa att avinstallera SP2 och sedan installera det igen.

Annars hittade jag detta på techarena.in

"I think I found the solutoin courtesy of "Smart Computing" Magazine May 2006
issue. Type this from the command prompt:
proxycfg -d
net stop wuauserv
net start wuauserv
exit
Also disable any third party firewalls and virus protection.
Mike"