Oh wow! Must be a treat haha
You really have tempted me to get a new GPU :@, not cool man
Probably temperature. The OS crashes right?
If the system is freezing and only the cursor moves eventually followed by two beeps, its usually temperature.
(Get precompiled bootable iso in zip format)
and burn the archived iso using imgburn, goldenhawk clonecd, etc.
Just boot the burned disc and run using whatever preconfigured deep/extended/etc analysis that is made available to you.