Let's try this. Reboot. As soon as the system starts to boot begin tapping the F8 (function) key. This should take you to the advanced boot option screen. At that screen choose "Disable Restart on Error" (the exact wording may be different - I'm not at a Windows 7 system at the moment). Next time the blue screen error appears it should stay up. If it does, please post the entire contents.
Also, when you say you try to reinstall Windows are you formatting first?
And last, what is new or different since the last time everything worked properly (ie, new hw, new sw, virus, error, etc)?