|funny, because i'm reading your posts with a Russian accent. It helps me understand :)|
So, when the computer was part of the domain, the domain administrator pushed out GPOs "Group Policy Objects" so "end users" couldn't screw around with stuff, like the firewall or the domain settings. They could just go to work and do their job. But now you don't want those limitations so you want to reset your GPOs to their default so you can screw around with stuff. Like "removing the computer from the domain"
There are many ways of doing this, but I thought this would be the easiest. One more question, I just thought of, are you logged in under the local machine or are you still using the domain account? Let us know.
You can use wikipedia for definitions of any of the terminology.