Windows 7 x64 - Proxy details not being applied to 32bit Internet Explorer
Finally! This has been driving me mad for months, I actually dumped 7 at work six months ago because of this.
When running a domain on Server 2003 when your desktop client is x64 Windows 7 you'll find IE will not pick up the proxy settings from the GPO.
What I found today was the x64 version of IE was fine - however given the bad coding by some programs - in this case Genuine Advantage(!), it needs to find the proxy from the x86 version of IE.
You can't change the settings manually as its all greyed out.
Whack the following into a registry file and apply. From what I've read is that the setting is in two places in the registry and for some reason the GP only updates the x64 one.
KB Article on this: http://support.microsoft.com/kb/952031
Windows Registry Editor Version 5.00
"ActiveXCache"="C:\\Windows\\Downloaded Program Files"