Odd Windows 7 IE Group Policy being applied
We've got a problem with appears to be rogue Internet Explorer Group policy or setting being applied (see below). Every time I go into the LAN settings it shows "Some settings are managed by your system administrator". It's currently set to an incorrect proxy setting which is preventing users from changing it and updating to the correct proxy even though that's set in another GPO. I've tried moving computers/users out of all GPO's with nothing other than the default domain policy but the LAN proxy settings are being applied regardless of whereabouts I move the affected computer/user. I've checked local and AD group policies but can't see this being set anywhere?
I've even tried logging on as a local user account to that computer but it still has the settings greyed out!
I've checked all relevant group policies, local policies and I can't see where this is being set. Can anyone suggest other locations where it could have been configured? I'm starting to wonder if it's been installed as an IE managed install which has it hard-coded as part of our standard computer image?
Any suggestions would be appreciated!