If your PC is dead (powersupply, mainboard etc.),
your harddrive or your ssd might be alive.
Just open the case and rescue your hardisk or ssd.
Then buy an usb-adapter that fits (Amazon) and
plug it in in your new PC.
The folder you should search for is:
...\ET\etmain
There is a file called "etkey".
Copy it to your new installed RTCW:ET in the folder ...\ET\etmain .
much fun...