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ClockInit Failed Error after installing Gigabyte VGA utility

I have an AMD computer with Gigabyte PCX6600 DV256 video card.
OS = Windows XP professional
One bright day the screen didn't display anything, so I reinstalled all of the NVidia drivers.
When I tried to install the Gigabyte accelerator utility and restarted the computer, I got the nvu ClockInit failed error + "Reference memory 0X000 could no write... " and my screen performance got very bad.
I tried reinstalling drivers and VGA utility including updated drivers I found on the net, but nothing helped.
What can I do? Could it be that I need to replace my video card or is it a software problem.

Thanks in advance,

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