Help , 8800 gtx random glitches and hangs

Hey , i'm kinda new here and really need help . I'm using a XFX 8800 gtx 600m and running on vista ultimate x64. The computer seems ok after a complete reformat all the time with the proper drivers, however after a few months of updating and all i start expirencing weird blue dots the first time .. and now after 6- 7 months red dots (after a fresh reinstall of system) now its all kinda of wierd glitch like boxes and in games it starts to have the non-responding error and it hangs .. i really need help .. 8800s were not cheap during its days..

Overheating, not enough current from your power supply. It could also be driver issues. Try add/removing the drivers, run a driver cleaner, reboot, reinstall new drivers.

it seems to be the driver problem. do you ever update your 8800's driver? if updating driver is the problem, then use the driver that the oem provided. You should refer this problem to nvidia support team (Support)

It could not be overheating problems as i've been using it long enough without any problems , i even had it overclocked before and had no problems .. power also could not be the issue as it is fairly normal all the time .. psu CM 700w .. and weirdly i've tried uninstalling and re-install fresh new drivers and it does not help .. and i dont update my drivers , could it be a windows update that is causing the problem ?