We're trying to set the following option in Group Policy ( Machine > Windows Settings > Security Settings > Local Policies > Security Options > Devices: Unsigned driver installation behavior ) to "Silently succeed" but the clients don't seem to get the setting.

Other settings in the same location like "Interactive Logon: Message text for users attempting to log on" are been applied fine.

I've tried setting "Security poliicy processing" to process even if the GP hasn't change but it's not helped.

Also have tried telling windows to wait until the network is ready and again no help.

GP was created on a XP SP3 machine and is been applied to a XP SP3 machine, it is not a AD GP.

Anyone got any ideas?