Css Error: Trojan Attack!!

[Sacrifice4css]

Hi my name is Sean and i am having a very difficult time trying to play Css. Every time i open Css my anti-virus notices me that it detected a Trojan. It says it located in my C:/ under counter-strike source\hl2.exe. I went to the location it told me it was from and the hl2.exe folder does not exist. I have tried uninstalling steam reinstalling it and downloaded Css again but it still pops up with a Alert. Every time this alert pops onto my screen Steam says that the game is unavailable and exist out. Please help me with this i cannot find a way to prevent this from happening.

Thank you,
Sac

 

[Vegeta897]

Disable your anti-virus, or whitelist the exe if you can.

 

[PJ]

What is your AV software?