Just installed iATKOS v7 on Dell Vostro 1500

[bladerunner23]

Dell Vostro 1500
2GB Ram
NVidia 8600GT

Everything seems to have gone fine apart from the fact that whenever I move boxes or scroll up/down on the internet it looks awful and messes up.

It's probably something to do with my NVidia card driver not being installed, but I read on an install guide I shouldn't install the graphics card driver until after installation.

Can anyone help?