Any prior misbehaving or it just happened? Anything recently done?
FYI- Since you didn't provide any further clue or what else is part of your PC, I have to guess. If this happened just after some Win7 updates, you may have a glitchy PC. The MS-update /KB2859537 x64 maybe at fault. You need to boot into "safe mode" and using the OS restore feature pick a date prior(restore point) to the problem appearing.
The other cause maybe h/w related, so it takes more info to narrow this down. Do the usual. open PC case and clean the dust bunnies out and see if that helps. Check the innards for damaged devices, etc. or obvious damage as it were. As for the BSOD, any error displayed? If yes, google that error for a clue.
Ok so I am pretty new here and also not very good on the computer. Here is my problem, my computer blinks and when it comes back on the screen size changes. Also it freezes up and sometimes I get the blue screen of death. Not sure if this is an easy fix or need to take it to someone. It is an emachine ET1331g-07w, thanks.