Admin rights

I have several old PC’s in which all local admin accounts have numerous restrictions on them such as properties of my computer and control panel. I have checked the local policies which are empty and used MS Fixittool to reset the secuirty settings with no luck. Only the Domain admin has full rights. Unfortunatley these computers are not a member of the current domain and there is no way to dis-join and re-join to the new domain because of the restrictions. Seem to have tried all possible aveneus to no avail. Any help would greatly be appreciated.