Vista Administrative Password help?

I need to know the admin acc password on my comp without changing it. in xp i'd just use the safe mode and create a new admin acc and change my status, but vista doesnt let me do that. is there someway i can change my acc to administrator without using anything that involes being an admin already? (i mean no cmd, then run as admin, that really doesnt help)|||If there was, it'd defeat the purpose of the admin account. I hate saying this because I say it often, but a system re-install will fix it without damaging most of your personal files, if you're desperate, that is. Be sure you know the product key and have all the correct credentials before you begin, though.