One of the easiest ways for older cards is to go to windows update.after all the garbage is loaded check the left hand pane for hardwae updates, most vendors were so keen to get on the SP2 bandwagon they posted all their driver and firmware updates there, alternatively also in the left pane click on administrator options, this opens up a huge range of hardware updates.If you have no luck there go to the best driver site on the net,
www.driverguide.com,they have a great data base with filters and links to manufactures. Also another great program is Belarc Adviser.it analyses your system and even the freeware version lists all your hardware and software with the version ,driver ,driver version and even your windows product code. Hope this may be of help,
Cheers ragzeeboy