I'm unable to run the Group Policy Editor for the domain even though I'm a domain Administrator.

Start Active Directory Users and Computers snap-in (Start - Programs - Administrative Tools - Active Directory Users and Computers)

Right click on the domain and select Properties

Select the Group Policies tab

Select the default domain policy and click Edit

Move to User ConfigurationAdministrative TemplatesWindows ComponentsMicrosoft Management Console

Double click 'Restrict Users to the explicitly permitted list of snap-ins'
Click here to view image

Set to 'Not configured'

Start Registry Editor (regedit.exe).

Move to HKEY_CURRENT_USERSoftwarePoliciesMicrosoftMMC

Double click RestrictToPermittedSnapins

Set to 0 and click OK

Close the registry editor

Start Registry Editor (regedit.exe).

Move to HKEY_CURRENT_USERSoftwarePoliciesMicrosoftMMC

Change the Restrict_Run value to 0 in the following keys if they exist:
{8FC0B734-A0E1-11D1-A7D3-0000F87571E3} (this is the restriction for Group Policy snap-in)
{0F6B957E-509E-11D1-A7CC-0000F87571E3} (this is the restriction for the Administrative Templates)

Close the registry editor