COD 4 MP Crash... [Fixed, thanks all <3]

[sbbx]

I recently downloaded/installed COD 4 from Steam and everything was running fine (I've played this game and uninstalled/installed it plenty in the past, although from a CD). I never play single player so I deleted the shortcut from the desktop, went into SteamApps and copy/pasted the COD 4 Multiplayer App to put a shortcut on the desktop. EVER since I did this COD 4 crashes on start up, or if I try and launch it from my steam library I get to the single player fine but it crashes when I go to Multiplayer on the main menu. I tried a system restore... I re-downloaded the game which took about 6 hours on the connection I'm on (terrible DL rates plus it's shared, although it plays fine when my roommate is offline), and neither of these steps have worked.

All I did was move a shortcut and I have no idea how this could change the way the game runs in any way. Any suggestions and help would be greatly appreciated.

Note: It does the same crash when I try and load dm1 files through COD 4 Player. I hear the error noise, but the error message is obscured by a black frame which is the COD 4 iw3whatever application.

[sbbx]

Also.. I've tried launching this game from every which way. Steam re-install is the best bet at this point? When I tried launching iw3mp from the Call of Duty 4 folder I was told mss32.dll was missing when it is clearly in the folder. I tried some fixes for that problem that I saw on youtube to no avail.

[cad80_99]

what fixes have you tried. did you enable stereo mix? try to plug a mic and headphones in?

[sbbx]

Yep tried that. Let's see.. I tried

Making a new iw3mp shortcut in the COD 4 folder
Completely re-installing the game.
The stereo mix/mic thing you mentioned
Windows restart
System restore

Somebody recommended re-installing DirectX9 which I will give a shot but probably not until tomorrow. Cheers

[Danger]

Verify the game cache. Update video drivers. Reinstall DirectX and try again.

[sbbx]

Fixed the integrity of the game cache and that did the trick. Thanks a million man!