How do you restore a default dc policy?

I am having problems with the security settings in the dafault domain controllers policy. When I access the security settings node, a message stating “Windows Cannot Open Template” is displayed on the right half of the Group Policy window. Should I restore the basicdc and securedc templates from my Windows 2000 disk? I have appplied both. Is there a way to get back to a clean policy? Deleting the policy from the Group Policy properties screen does not seem to work.

My problem is that the current group policy settings have deleted users in them which cause errors when i apply the settings.

Thanks