1. have you tried uninstalling the drivers, then installing the ones that came on the cd with your video card? other then that im not sure..finding drivers for me is about as easy as climing mnt everest with your teeth..
as for your second question, you may not have directx 9 installed on your system, although the video card is compatible. you should prolly pickup the newest version of directx9 from microsoft.. its located somewhere around here:
http://www.microsoft.com/windows/directx/default.aspx
that shoudl hopefully help you with the sims at least

might i add, the sims 2 is a really good game, you wont be dissapointed. it was worth every penny i paid for it...and i actually bought a game for once!
