I had a problem with intermittent BSODs, as many as two a day and usually once a day.

ATI drivers were frequently referenced as the cause but other tasks were also indicated.

I tried a new power supply

I ran Microsoft's memory test http://oca.microsoft.com/en/windiag.asp

Nothing seemed to work.

I finally removed ATI software entirely according to http://www.tweakguides.com/ATICAT_1.html

using ATI removal tool https://support.ati.com/ics/support/default.asp?deptID=894&task=knowledge&folderID=293

and deleting all ATI files from the system32 folder.

I then cleaned the registry of all ATI references using Registry Mechanic http://www.pctools.com/

I then reinstalled the original disks that came with the card.

Problem solved, no BOSD for two weeks.

Possibly, while updating drivers to keep up with the latest version, I may have acquired a defective file.

While most gurus recommend always having the latest drivers ATI offers the best advice.

• Installing a new driver is only recommended if you are having issues with your ATI product.

In other words, IF IT AIN'T BROKE, DON'T FIX IT"