Hey guys im having problems with my new build. currently it has in I5 2500k, asrock z77 pro4, gtx 560 ti, and a 500 w PSU, with 8g ram. I was able to install Windows 7, but my problem is that it sometimes freezes at the welcome screen, and iwould have to turn off the computer and try again. When i do get on dr about 5 minutes it freezes again. can any tell me what my problem is? thanks.