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There is no virus for a mobo BIOS in the past 10 years. There is no software that can check a GPU BIOS for a virus. If you really think you need it the only place you get it is by contacting the MFG of the card and ask them.
There is a chance that system overheats. I would start from cleaning dust from internal coolers of computer. Then I would suggest to put additional cooler on Graphic Card if it has passive cooling. If that not sort your problems out then I would suggest to test you hardware. Test Hard Drive, RAM and put some stress tests on CPU and GPU. Good luck!
Hello sifian_786, did you try to uninstall old video driver and restart computer and go to nvidia website and download latest driver for you video card and install, restart computer this should solve problem you have, are you trying to run dual LCD monitors ?
I beleive that your onboard is pretty much the equivelent to the geforce card you have spec-wise. But the 3300 a much new technology and has a faster processing speed in comparison to the geforce 6600 (not sure about the 7200).
In anycase, if you get yourself another ATI HD card (2400, 3450, or 3470) you can actually run them both as a Crossfire set up. Also, you can slight overclock your onboard video just a tad if that is a route you wanted to take.
The HD 3300 onboard was meant to be a better option over more entry level cards on the market today.
If you're still not sure, you can always do a 3dmark or gaming FPS test on each gpu to see which gives you the best outcomes.
is it summer now there? It sounds like heating problems. If you keep the system very cool does it still do the same? (Try opening your side panel, and putting a fan in front of it, blowing into your case, also check to make sure that the fan on the gfx card can spin freely and isn't hampered by dust particles. Also do you have thermal paste? i recommend taking your cpu heatsink off, wiping off the old paste, and applying new paste. I've seen thermal paste get old and then cause this kind of problem. If that still doesn't work, try drivers like bunny recommended. Good luck! :)