Clean PC Solves all CF issues.

St4Ydown

My PC works fine.

B00mshaka

If you go to school/college in the UK you can get Win 7 cheap here
http://www.software4students.co.uk/Microsoft_Windows_7_Professional_64_bit_Upgrade_Edition-details.aspx
only £39.78
This is not a rip off site, they are genuine but you must go to a school/college in the UK to qualify for the software.
I've got Win 7 and office 2010 from them.

Edit. It is the full genuine Microsoft software, not trial copies or anything like that.