Just finished SP and wanted to give MP a try, but I find 0 servers available. Looking in the forums I see there may be a patch or two I missed and this may be the reason for my no servers. The question is, how to patch? I have the box CD version...also, not sure how to determine the version I am playing as well.

Thanks in advance for the help!

Go to your game directory and bin32 folder, for example C:\Games\Crysis 2\bin32.
Look at the properties of Crysis2.exe and see if it is version 1.2.0.0.
If not, the game should auto patch when you fire it up. If it doesn't you need to manually download and install the patch from HERE

try launching the one that says launcher not .exe once