Problem with my 5920g

Hi guys, i am a new user of laptop so i don't know much about it and not so familiar with updating drivers. Recently, i updated my 8600 driver to 158.45 as suggested by many people for OC purpose.

During the 1st time, i just ran the setup dl-ed from laptopvideo2go website with modded inf without uninstall my old driver. Later i found out from some where that i actually need to uninstall it 1st before install the new one. Its was a few days after i update it but i didn't encounter any problem just with a few crashes during gaming. (My screen turn black suddenly and my hd stop running for less then a minute before they turn back on and my game continue).

Thus, i suspect my driver has something from so i reinstall it again by uninstalling it 1st. But the problem continue, so i search around in my computer and found a event log as shown below. Seems like a new event log was generated every time my lappy crash. Anyone one here can tell me what happen? Issit because of my setting? or its normal.

I use riva tuner to OC with 590/470.

and btw, does anyone know how to turn off the mic? For no reason my mic tend to be on even after restart. Its very irritating as sometimes some very high pitch sound came out from my speaker.

Lastly, i apologize for my crappy english.