I re-installed windows 7 (using the same cd as before) on my desktop but now for some reason my games won't work - CSGO will open but then just stops working and "stoppped working, windows is ckecking for the reason" type message appears. Same with Guild Wars 2, especially when I go into an instance, it stops working almost immediately. Aion won't start up at all. I redownloaded all the games, and ran my graphics card cd but nothing worked. I also tried to run it off an external hard drive but same thing happens. What is going on?