I was able to run SFC:OP on my computer without problems before (with the 8 MB internal vid card). But lately I've been getting explorer error message when I leave my computer on for too long. If the new OP+ thingy as upgraded the graphics a little bit then yes that might be why. But I did buy it in 1999 and it is old.
I've tried buying video cards but everytime I had problems playing games. The only game I managed to play with a video card was Combat Flight Simulator 1. I managed to play one game of SFC OP with a new card but then problems started appearing (computer crashes). Probably because I didn't know how to disable the build in one. ButI did manage to get a refund everytime or store credit.
I'm not gone throw my money for just a vid card. I need a new computer period. As soon as I find a new job (hopefully very soon). That will be the first thing I do. But for now. I use the old one to surf the net and for microsoft Word. Thats all I need really. I've got an Xbox for games. Although I do miss SFC from time to time. LIKE RIGHT NOW