Also blue screen of death.
Dell Dimension 4600 series
OS: Windows XP with most recent updates
What was going on: I had a few windows open but not more than I've had before. Also open, I had Firefox working in Google Docs which I've noticed hogging memory, solved only by closing FF and reopening.
Dell Diagnostics showed IDE Confidence Test = fail.
I interrupted the Diagnostics test at 74% after seven more tests passed and it looked like we might have the culprit