You updated the card, or do you mean the drivers?
If you updated your card, you should have un-installed the old drivers, then put new ones in for your new card after you installed that.
If you are running Vista/Win7, then your video memory is shared with your RAM after it gets used up. If you have a 128MB card, and you run Vista/7, AND your RAM is all used up, you'll get this error.
There may be other reasons but that is all I can come up with for now.
