Hack tool has been detected (1)(2.0)

Well, when I walk in the crossfire, I for one server, but when I walk into a channel the following message appears:
Hack tool''has Been Detected (1) (2.0)''
I would like to resolve this problem.

Remarks:
• I do not use the Game Booster
• Do not play with any open programs except AVG.0
• I have no hack downloaded

Thankful!