Used a genuine windows 7 ultimate upgrade disc to do windows 7 ultimate bootcamp clean install and it works fine on one try. After installing bootcamp drivers in windows I opened safe mode and modified several folders in the register and then entered the serial. Next Connected to internet and wala Microsoft Licensed it as a full genuine version with genuine badge.
For those of you wondering if you can do a clean install with just an upgrade disc of windows 7 it is very possible. I get genuine updates and it has been running fine for 3 months now.