Valve & XTreme-CStrike is a software developer for Windows.
It is reported that the following Windows processes are part of XTCS Counter-Strike 1.6 Final Release:
If you want to remove XTCS Counter-Strike 1.6 Final Release from your computer, just go to Start > Control Panel > Add/Remove programs and select XTCS Counter-Strike 1.6 Final Release from the list of programs.