As the others suggested.
however, i think is MAY be due to an overclock, because ive had the EXACT same problem, and i fixed by removing my overclocking.
Another problem is POSSIBLY the BIOS. Again, tis only a possibility. could be a bad driver. HowevermI used to have my computer randomly freeze and the vidcard game me this error, and sometimes i didnt even get an error. To fix that, i had to update my BIOS, but be VERY VERY VERY VERY careful while doing that, you could screw up your system. So really research on how to do that, and if the above PSU suggestions dont help, approach the possibilities i have mentioned, with the emphasis being laid on the overclock and driver, and not on BIOS update. Research, get expert help and only then should you attempt to update your BIOS.