It's a worthwhile upgrade though, once you learn all the niceties of Win7, it's fan-dabi-dosi
Bugger, found a 'suitable' card and drivers for Win7 32 bit - then reread the Sims3 specs at the bottom listing the compatible graphics card (missed that the first time) and although the other tech specs match, the card (fx5500) wasn't a listed supported card
I think those may only be PCI-Express cards or have too much memory for your CPU