Careful using the term "keygen" around here! Some may take it out of context and report you as a pirate, even though you purchased it legitimately.
A keygen (short for key generator) is a tool used to make product keys for software, so that the user doesn't have to purchase one.
Did you clean the drive before you installed to it? When you are ready to reinstall, do a clean all
from Diskpart. Be sure to remove your backup drives first! Disk - Clean and Clean All with Diskpart Command
Test RAM whenever you get a chance. It can be tonight it you wish, as no backup is needed, and it doesn't involve Windows 7 or XP at all. RAM - Test with Memtest86+
Finally, when you reinstall, disconnect all unnecessary hardware, such as webcams, external hard drives, additional video cards, and other USB devices.