Blue Screen?

Ok i'm kinda confused, im running Windows 7 x64 bit OS. I usually always get a blue screen and have to re-install the OS. We'll now I have the Windows 7 recovery disk, so I recovered the OS, but how do I prevent from getting the blue screen and a corrupt hard drive. The last thing I remembered I installed the nintendo DS emulator and all of a sudden I get a blue screen like 30 mins later. It's just kind of annoying, I just don't what the problem is.

 

see if there is an updated version of the ds emulator you can try, or possibly run it in compatibility mode...:confused