An Issue with your computer??

[RAMA]

Hey everybody..

Today when i tried to game some css, i got this message

"An Issue With Your Computer Is Blocking The VAC System
You cannot play on secure servers"

Can somebody tell me why and what can i do?

Thank u

 

[Lifeless]

Tried these solutions?

http://forums.steampowered.com/forums/showthread.php?t=3240945

 

[Blue™]

had this issue aswell, restarting the pc worked for me

 

[RAMA]

I have tried to restart computer, dont help.
But it working now, i have not do anything, it just working again

Thank u guys..