Every time I exit the window to end the level "Urban Wreckage... or Ruins or whatever it is called" I am sent back to the main menu being told I was Disconnected from the Server. Not sure what is causing this, but I've just about had it with how many things I've had to fix to make this game work.

EDIT: I figured it out. If anyone else runs into the same problem this is the solution.

Download the 4GB patcher (this is the one I tried) or the Large Address Aware tool from this link:

(I'm told I can't post links, sorry. Just google F.E.A.R. disconnected from server and the PCGaming option will lead you to the links)

There is also an option in settings called "Forced Restart," but I haven't tried it so I'm not sure. People also say lowering graphics settings will work, but I'd try the "Forced Restart" option first, or the options above.