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1. turn off Windows setting that enables automatically reinstall of drivers. (google it)
2. if you have any overclocking software make sure it's running stock settings and close them (also ensure they do not start on startup)
3. download the driver and save it to desktop. reboot
4. Start driver on desktop and if it's nvidia drivers make sure you check 'clean installation' and install in the default path.
5. once installed reboot.
If it's still not working try window restore. Sounds odd to have it happen completely outta the blue though so a graphics card replacement may be a long term solution if it does come back.
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