Okay, so my laptop broke this morning.
My mum recently bought a new PC and is letting me use is for the time being.

- Q8300@2.5Ghz
- 6GB DDR3 RAM (unsure what speeds)
- nVidia GT 320
- 1TB HDD
- Windows 7 Home Basic 64-bit

I'm unsure what motherboard it has, and I'm unsure whether that's important to my problem.

Okay, so the problem is this; I installed Call of Duty 4 on this PC, installed all patches up to 1.7 and it works fine on single player, hits 125 constant no stress@1024x768 with 2xAA, full textures and all the effects and commands that i could remember that I used on my other config... This worked on Single Player, so I opened up Multiplayer, launched a Killhouse Listen Server and did the same thing I did with the Singleplayer, (edited graphics, console commands, etc.) after which I closed Call of Duty 4, opened Xfire and looked for a server to play on.
I attempted to enter a server and got a black screen and the blue spinny icon, (the one that replaced the hourglass as of Vista onwards.) confused, I tried to open Multiplayer manually. The same thing happened.

*Reboot*

On reboot, I opened Xfire and tried to enter a server. Still no luck.
I re-installed the game and the patches and the same thing happened; Singleplayer worked fine, but the Multiplayer wouldn't open; not even once, this time.

I thought that maybe it had to do with 7 64-bit, so I had a read on the net, and some guy on sevenforums claimed to have had the same problem a while back, and fixed it by changing these files: C:\Windows\SysWOW64\PnkBstrA.exe, C:\Windows\SysWOW64\PnkBstrB.exe to run in Vista compatibility mode, and it solved his problem, so I thought "Why not, I'll give it a go."
When I entered the aforementioned location, I didn't find PnkBstrA.exe or PnkBstrB.exe

I figured I'd come here, as I doubt I'd be only one in the whole CG community to have come across this problem before.

Any solutions or ideas?

Thanks.

Edited once, 18/7/10 - 5:33pm.

Hm, this happened on my first computer..i could play the single player but not Multi-player,
I never really looked up anything about it, so yea best of luck finding it, since then I've sold that computer and built another one, and it's perfect on this one, nothing's wrong so I'm liking in, but
Best of luck finding it man, as if would be annoying.
<3

Aw crap. Dx
Haha, thanks anyway. Cx
Was your old computer 64-bit or something similar you can think of to this PC?

Update: I've run Punkbuster scans, it appears to be working fine, tried disablind Firewalls, turning UAC off, running as Administrator, running in Compatibility Mode... Sigh... Just doesn't want to work for some reason. /:

I was running,
-Windows XP 32-bit
Nvidia 9800GT
AMD Athlon x2 2.7ghz
2GB ddr2 zepplin ram, can't remember the speed,
80gb hdd for os, 160gb for everything else,
and yea that was basically it, dude.
Best of luck, once again.

Okay, thank-you for your help.

No prob man.

Waits for Grumpy/Lantern to post.

^

+ Just updated nVidia drivers, didn't fix the problem.
Also, CoD: WaW works if that means anything.
Singleplayer and Multiplayer.

Edited twice, last edited 18/7/10 - 5:46pm.

When the game freezes, has the game already crashed with error in the background? or is it just waiting for nothing to happen. Make sure you have all your correct drivers installed. It probably stopped working because you changed something in your config, and when you uninstalled, because you have Win7s UAC on your config doesnt uninstall, as far as i know. So because its a new PC just turn UAC off, go to control panel, user accounts, and itl be there, parental controls or something. Restart, then try open cod4 again, you will have to redo your config probably, just be carefull what you change

The first thing I did when I started using this PC was turn UAC off because it annoys the absolute crap out of me, told me to reboot, so I did, and when I installed it in the first place I didn't change anything in the Multiplayer config and it worked, so it can't be the config, I don't know why it would be though. :S

Um... I'll try rebooting and reinstalling again and when that's done I'll come back and update.

Update: Okay, well it happened again... Unsure what's going on, but this is really frustrating. -_____-

Edited once, 18/7/10 - 6:13pm.

lol

Good advice, thanks, I'll give it a go. -___-

People have experienced problems in the past from cod4 multiplayer on the vista/win7 operating system due to the onboard sound cards.

Normally when my cod4 got this black screen it would crash showing me this error "iw3mp.exe has stopped working". Are you getting that error?

Is your onboard sound RealTek(TM)?

1. If so, then you will need to go into your control panel and open RealTek(TM).

2. You then need to click on the folder icon in the top right hand corner and click "disable front panel jack detection"

If your not running RealTek(TM) on board sound, just try plugging some headphones into the microphone jack in the back of your pc.

This is what helped me. BOL

Edited once, 19/7/10 - 9:31am.

yeh frenzy is right.. same thing used to happen to me.

Or plug a mic into your mic jack >.<