My windows partition on my macbook pro was playing up (unexpected restarts, blue screen of death then a restart, stuff like that) i tried using a file registry cleaner and it found problems with my registry every 5 minutes.This certainly wasnt due to a virus because i had antivirus software (AVG) and the only sites i went on were ones to get software such as skype and itunes. So i reinstalled windows, reinstalled all the games and all the software, just one day after the reinstall it gave me the blue screen of death again, any ideas? because im entirely out of them. 
P.S. ive also tried to repair this disk both with the mac ‘Disk utility’ and after restarts windows starts a disk repair thing too, neither seem to have had any impact.
Thanks in advance any help is appreciated.