Go to the troubleshooting page on the RIFT website?
It's not ONLY when I play RIFT, now it happens all the time -_-
Coincidences, but did you at least catch what the BSOD said?
Is your computer overheating?That wouldn't explain the bsod but part of it.
Sounds like a hardware failure or overheating. Download HWmonitor and monitor your temperatures while playing Rift.