Sorry for being superficial, here's the setup:What happens when you remove the graphics card and revert back to the default setting?
At least do some basic troubleshooting before crying for help!
What Windows OS?
Power supply wattage?
have you tried booting in safemode? is it able to do that?I've had some amd driver problems.
it looks very much like an incompatible driver.
most of the times I have solved the problem by changing several drivers until it gets sluggish.
try with another old driver for which I have opinions that is stable.