Two possible solutions.
1.
ftp://ftp.icq.com/pub/ICQ_Win95_98_N...cqpro2003a.exe
I couldn't login during the day for two weeks until I removed 2003b and 5.0 entirely and reinstalled 2003a.
2.
http://www.icq.com/boards/view_messa...opic_id=460204
Didn't try this one, but it may work as well.