Don't use steam app to launch RTCW. Use the WolfMP.exe directly to launch RTCW.

Save your CD KEY in a file called rtcwkey and put it in your RTCW main folder.

%base%/main/rtcwkey

In order to play fullscreen without blackbars you need to open your console using the ` key and enter

r_mode -1; r_customwidth 1920; r_customheight 1080; vid_restart

Your config file might be read only. This happens a lot when RTCW is installed in Program Files in windows. Try moving your entire RTCW folder to your documents or desktop for example.

Use the RInput program, this will let RTCW use 1:1 raw mouse input.

Run WolfMP.exe, open RInput as administrator, type WolfMP.exe and press enter

Open your console using the ` key and enter some or all of the following

forcefps 125 //sets max fps

r_swapinterval 0 //disables vsynch

r_primitives 2 //fixes fps issue with newer processors

r_displayrefresh 0 //sets monitor display refresh to match windows

Run PB Svc Installer (as administrator, from Start Menu) and install services (ignore possible errors). This is located in your root RTCW folder.