Connection to...VAC problem?

[redstarfish]

Thats what I get. I go on css, and I can play for a few minutes (And I note that steam doesnt show up, the shift tab) and it disconnects me with this. Can someone help?I tried restarting steam but it says css is still open, which it is not.

 

[Ric]

Please find me on STEAM: rickeh696969 and I'll explain the steps to resolve this.
I just helped 4 people with this issue last night, seems to be getting everyone sick.