I'm thinking that if you are getting that blue screen on both OS's, that it is most likely something hardware related. I have a suggestion. If you have a CD/DVD drive, Download, burn to CD, and run a copy memtest86+ 4.00 to test the ram. Your windows 7 install DVD should have a memory test utility on it as well. It's in the area called "Repair my computer" when you boot from the windows DVD. If you don't have a CD/DVD drive, try a copy of Ultimate boot CD which you can run from a USB stick. That also has a copy of memtest86+ 4.00 on it.