ATI doesn't allow linking to support sessions, hence the expiration.
Assuming you have Windows XP then go to:
http://www.ati.com/
And look towards the bottom left of the page. See where it says:
"Catalyst™ for Windows® XP
Version 5.6 with Catalyst™ Control Center (32MB)*"
Click that and start the download. And then you will have the latest drivers.