Key not valid

[.Sup]

E1ghth try this:

1.Goto START menu select RUN
2.type 'regedit' and hit enter
3.Navigate down the menu Computer -> HKEY_LOCAL_MACHINE -> SOFTWARE -> Wow6432Node -> Electronic Arts -> EA Games -> Battlefield 2 - ergc
4.Double-click the Default file in that ergc folder to edit the data string (delete any characters that are present)
5.Type "x9392" followed immediately (without spaces) your product activation code in CAPITAL letters. Do not type any hypens or spaces. Hit Ok and exit regedit.
6.e.g. x9392AB74GYVNTZ6JL23GFR45 (these are just random characters - don't use it!)

[styphon]

Shouldn't work. As far as I know the cdkey stored in the regestry is encrypted. That means when you enter the unencrypted key and the program decryption key it will come out wrong. To put the correct key in re-install the program.

[Goggles]

I'm curious about if it works or not

Standard disclaimer that should be added whenever you mention regedit.exe -- make sure to be careful when dealing with the registry - mistakes can cause some pretty unpleasant side effects :S

[Hitman47]

Save the original file somewhere safe, just don't forget where

If u have 2 PC accounts, try logging into the other one and play BF2 on it, because the game will let you play only on 1 PC account. That's the problem I had