So I recently downgraded from windows 10 as it was hard crashing giving me error messages like "Critical process died" or "Memory Store error"(or something along those lines) and now on windows 7 it is doing about the same. It is very random, some days it wont at all, some days its within 5 minutes of boot up with nothing running, and during gaming. Sometimes it freezes before crashing and I can still hear audio and talk to friends, sometimes it instantly blue screens. Any ideas? Ive checked my disks, did a memtest, reapplied thermal paste. Windows update will just go on forever if I click check for updates, and I noticed in device manager I have an exclamation point near one of my USB controllers but cant fix it...