Ok so I installed Windows 7 then all my games.

After i installed cod4 non steam version i put in the serial key then tried to join a server and it wouldn't let me. So i exited and found a new key but i think instead of opening my non steam cod4 i actually opened the steam version and replaces my steam cod4 serial key with a random key so now neither of my cod's work. What do?

Not very helpful...

Yeh man, that is some bl

Idk pm a moderator

So you originally bought cod4 on steam? Contact their support.

Yea I originally bought CoD4 on Steam and I accidentally changed the product key with a different key that is already in use so now it wont let me play and I can't remember my original key

I contacted Steam Support, but you have to give photos and c***, which I didn't do since I don't have a camera, but hopefully they respond.

Edit: Try this first: On steam, right click on cod4 and click the validate game files.


If that doesn't work go onto this: (this is for non steam cod4, not sure if its in the same place for steam cod4)


Ok first make sure you backup your current cd key just incase u need it somehow.

Then go start>run(just put in search in vista/7) and type in regedit.

Goto Hkey_LOCAL_MACHINE>Software>

Right click Activision and click on export, save the reg file on your desktop or something.

Delete the Activision folder, (only the cod4 folder if you have other activision games)

Try run the game from steam again, hopefully it resets to the original key.

Good luck

Edited once, 11/8/10 - 3:38pm.