ForceWare version How to install an appropiriate forceware?

Hi all,
I have a vgn-z540 laptop with 9300M GS graphic card and Vista on it; its ForceWare version is 174.49. I have so many problem installing CUDA in it. even I totally deleted the driver once but I could not run cuda properly.
In my university I could easily install the last version of CUDA in a 8800 nVidia card.
should I install a new driver? I tried to update but nothing I could get