Hi,
Thanks for the post.
Please understand that "Devices: Unsigned driver installation behavior" Group Policy setting does not appear in the Local Group Policy Editor user interface (UI) on a computer that is running Windows Server 2008/Windows Vista/Windows7.
Given this situation, please refer to the following KB article to manually add the "Devices: Unsigned driver installation behavior" Group Policy setting.
How to let a user apply a Group Policy that has the "Devices: Unsigned driver installation behavior" Group Policy setting from a Windows Vista-based computer to a client computer
http://support.microsoft.com/?kbid=947250
Note: Based on my test, the above method also works for Windows Server 2008 and Windows7.
However, if you encounter any permission issue when saving Sceregvl.inf file, please perform the following steps to
1. Right click the Sceregvl.inf file and select Properties.
2. On the Security tab, click Advanced.
3. When the prompted window shows up, on the Owner tab, change the owner to the appropriate account such as Administrator.
4. Click OK.
5. On the Security tab, click Edit.
6. Click Administrator account and set Full Control to Allow.
7. Click OK.
Hope this helps.
