I have just faced this problem, and have got the same message, ( yesterday) but do you know why did I get this error message ??
I got it because I was messing up with the card trying to overclocking it, though I know that it wont overclock that well, but it was a kind of knowledge to get, so when I went high, my LCD started blurring with colours, that I couldn't get it back to normal without a force-restart.
then when I lowed my card settings it down a bit, I got it back blurring, but not as much as big it did before, and after the second restart I did, I lowed the settings again, and then started Batman: Arkham Asylum Demo, ( I played this one to see how different the game will do due to the system change )
so I really noticed a difference in the game play, but I started then to get the message you talked about, and when I lowed the settings of my 8500GT again, that message stopped poping-up .
but fore sure I finally re-set the card to its factory default, and that was due to that I am out of power due to my humble PSU.
I hope this piece of information helped you.
best regards.