"Call Of Duty 2" "Key Code in use. Please try reconnecting later" error (Not fixed...)

[Baratako]

It's a little complex, but I'l start at the beginning, so I asked my friend to give me the CD for "Call Of Duty 2" so I can install on my computer (Computer "A"), and multiplayer worked fine! So I decided to install it on my new computer (Computer "B"), but, saddly, I didn't have the CD case nor the CD itself, so... I decided to get a Pen and I putted it in Computer "A" and copy all the "Call Of Duty 2" content and I manage to pass it on Computer "B". And I tried to open it, and it worked, and I tried to play "Multiplayer", and clicked on a Server, I got an Error "Key Code in use. Please try reconnecting later". I tried clickng on diferent Servers, but same Error, So... any idea what should I do? Any help will be aprecitated, Thanks for reading.

KOOLGUY® (PT)

[nasyrest]

How did you find enter key code.I couldn't even find enter key code, so I can't play this wonderful game as a multiplayer. :((

[Baratako]

I didn't fix the problem directly, I just bought Call of Duty 2 on Steam and now works great.
And yes, I still play Call of Duty 2. :D