Blue screen error code. Please help.

late 2008 version.

Recently my school reinstalled windows 7 but after he did that, there was some blue screen error code which only appears while running on windows and everything is fine on the mac side.

He reinstalled windows 7 again but the blue screen error code started again. He said that it could be that my apple disc is not original which caused the error code, however last year they were able to installed windows 7 without any issue. He also said that it could be the hard drive problem.

Another problem I have is that while on windows the hard disk drives doesn't show the mac too.

Please help! Much appreciated if any of you can help me out.