Hack-Tool

hey ive got a question. I played crossfire for an half hours this day and i forgot to load my laptop. So my Laptop turned off.
After that i went to crossfire again and just wanted to start a game, it said: Hack Tool detected.

and it closed crossfire.

But I dont hack.!

whats that?

i really dont hack!

i was kicked two times that day cause i was Ace o.ô. Can it be that someone reported me that i "hack". ??
pls help me! that sucks.!