New
#11
If you don't have any Administrator account it would be easiest to clean install (or upgrade if it lets you).
You can try to enable built in administrator at boot following steps here but you'll need a bootable USB or CD anyway Solved Removed my Only User Account from Administrators Group
EDIT (OK you've got administrator account now).
So what problem do you have now? Does the start menu work on this new administrator account? (Note this mustn't be the built in Administrator - just part of the administrators group.