|In Windows XP, right click on the programme that he wants to run in 256, click properties, then the compatability tab, check the run in 256 colours box box.|
Click Apply, run the programme.
I don't see why it needs a new driver. It should just run an up to date one...
For Geforce MX drivers, go here : http://www.nvidia.com/object/winxp_2k_77.72.html