Hmm... I was rebuilding my old desktop to run DOS games over the weekend. I found an old nVidia 6200 with 64mb memory, and couldn't help but laugh. I think I bought the card in 2004, if not earlier.
The card I settled on for my PC was the 8400, which has 512mb memory. So basically, the card I'm using for DOS games from the 1990's (and earlier) has more memory - 8 times as much - than the card your using for FPSC.
You can pick up a decent graphics card pretty cheap these days, so if you can then I strongly suggest you upgrade. FPSC will suddenly become much friendlier with your PC