From Hakiwing Studio:
Antimessenger is a standalone software for Windows, designed for restriction of instant messenger programs(such as ICQ, MSN, YM, QQ ). After installed to a computer, antimessenger auto detects programs and stop the program if this is restricted. Antimessenger also contains automatic update engine. it used to update instant messenger definition. So that using Antimessenger, users do not need any skill because Antimessenger do all of them automatically.