so, your nvidia video card is made by ati...
tht video card is quite old, older and slower than mine(a 9200), my video card is struggling to handle the load i'm putting with kde desktop effects
you video card, being a model found in a laptop only can use 32 o 64mbs of ram and for kde and desktop effects this is insufficient
the video driver you have is probably the right one, the only one, this series of video cards, after 8 years of existence is not supported anymore by ati, the manufacturer so don't try to install the ati driver on repos, won't work and probably will leave you with a unusable desktop
in your case the desktop effects sounds like a bad idea, try compiz or just leave them off
please, when asking for help, provide more information than the one you gave us
we want to help but you need to provide more information, next time you can post the model of the mainboard or the model of the desktop/laptop, you can do a small search on the manufacturers website to discover more information