1. Remove invalid characters from the proxy exception list and then
clear the proxy cache.
Open Internet Explorer.
On the Tools, select Internet Options.
Click on the Connections tab.
Click on the LAN Settings.
Click on the Advanced button.
Please delete any entry in the Exceptions section.
Next, clear your proxy cache.
Click on Start, and then click Run.
Type cmd in the Open box to get a DOS prompt.
Type proxycfg -d at the command prompt, and press Enter.
Type net stop wuauserv at the command prompt, and press Enter.
Type net start wuauserv at the command prompt, and press Enter.
Now try the site again.
worked for me, other solutions at:
http://v5.windowsupdate.microsoft.co...cleid=26&ln=en