Repeating System Messages

Problem: User receives "You were added" messages (or other system messages) every time he/she logs on.
Cause: Adding one or more users to a computer
Solutions:

Note: This solution applies to ICQ 99a users. If you do not have ICQ 99a, download it here.

Shut Down ICQ (make sure there is no flower in your system tray)
Open Windows Explorer
Browse to your ICQ\NewDB Directory (Usually C:\Program Files\ICQ\NewDB )
Delete the following files:

########his.dat
########his.idx

Where ######## is your ICQ UIN