|ATI Radeon graphics cards and the blue screen of death ( BOSD ).|
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.
In other words, IF IT AIN'T BROKE, DON'T FIX IT"