I'm having no problems with the new ICQ 2003a or ICQlite. ICQ 2003a just uses a bunch of your system resources. The features are great if you use them only when you shut everything down like outlook express, etc. I use both, but mostly ICQlite just to stay online for messages. But anyway, This site has everything you guys need: old versions of everything! Check it out!
http://www.oldversion.com/