Reboot problem for my alienware x51 R3

I got my alienware and oculus rift set 5 days ago, but i'm having issue to get it work. After i updated my Geforce driver, the problem start coming, originally, it rebooted almost every time when i start oculus on the desk, and now i installed a different version of geforce driver, now it shows a similar problem---blue screen, says: your pc ran in to a problem and needs to restart.......the error: apc_index_mismatch. I have tried lots of ways to make it work, but not working, anyone know how to fix this problem? And the oculus headset doesn't show anything, seems no signal at all. i'm dying to get the this work.