bootcamp installing windows 7 freezes on starting windows red dot appears of logo animation and just hangs there for ever

I installed bootcamp windows 7 on my mac now im trying to install it on my friends mac... i have tried 3 different ISO via usb after the partition and the create bootable usb it restarts starts and it get to the point of starting windows a red dot appears wich is the logo animation and hangs there forever... i left it 6 hours and nothing happen.. I tried other methods to install windows XP by doing a Partition NTSF and inserted the DVD (windows XP) holding option key selected the dvd...it starts the progress and hangs in starting windows just like the windows 7 ISO.... im all out of options i tried several HDD, USB, USB ports, everything it wont get past the starting windows.... i have used, windows 7 64 bit and 32 bit ,home, proffesional, windows XP home, proffesional