Thank you for the quick replies. I will be getting a Palit Nvidia 8600GT 256MB DDR3 PCI-E Card. At the moment I have on board intel graphics. The Pc is about 3 months old I have 2GB memory and 450wt power supply. I realise that the CD will have drivers, but haven't a clue how to download later ones if I need to. Many thanks Peter.
There are 2 ways. Some users say you should uninstall the previous driver and others say just install over the old driver. I have always done the latter with no ill effects. So for (1) go into Control Panel, go to Add/Remove programs, scroll down to find your Nvidea driver and click on uninstall. Restart computer and you will be in ordinary VGA mode. Go to where you have downloaded the updated driver file, click on it to run it and follow on screen prompts to install it. For (2) just go to where you have downloaded the update file, click on it and again, follow on screen prompts to install it. I would say however, that if your system is fine as it is, there is probably no need to update the driver unless you are an avid games player. If system is fine by you, do not worry about updating for now.