Odd Gaming problem

[Zootoxin]

Good Afternoon you guys, if the majority of you have recovered from the LAN I was hoping if you could help me with a gaming problem.

I have tried googling but can't actually pin point the correct solution.

Problem:

When trying to play Day of Defeat, Left for Dead or Battlefield 2 the game will connect to the server (Many servers tried) allow me to play as normal for 10 to 30 seconds then freeze with looping sound until I Alt-Ctrl-Del

Other Points:

I can play Counter-Strike, Insurgency, Call of Duty, UT3, TF2 without a problem.
I have recently switched to 02 and received a new router; my download and upload speeds are faster than ever.
Ping on CSS and COD4 are the best I have had to date.
I am running Win7 (32-bit)
Latest Nvidia Drivers (XFX 9600 GSO XXX EDITION 680 MHZ CORE)
PC is Hardwired to router

What have I tried?:

Various graphical settings High - Low.
Various sound settings High - low.
Made sure all other devices are not using Wireless/router whilst testing.
Windows Firewall (disabled).
Router Firewall (disabled).
Nod32 (disabled).
All of the above at once.
Port forwarding for all games.
In terms of BF2 made sure Punkbuster is up to date and running in services.msc
I have tried speaking to 02 but they (as you would expect) point the finger elsewhere as the other games work fine.
I have also tried running as admin and compatibility settings on win7

Is there anything I am missing? anything you can suggest?

This is my MB and CPU - I could play fine in the past though

AMD Athlon 64 3200+ 2.0GHz Socket 939,
512KB
Asus A8N-SLI, nForce4 SLI,Socket-939
ATX,S-ATA, GbLAN,Firewire,DDR, PCI-Ex16


Please help

Thanks Zoot

EDIT: Answers:

@Oldie - I will try this when I get home tonight and report back.
@Tutonic - On Board sound only.

[OldBloke]

In L4D try running it in borderless windowed mode. Report back with the results.

[Tutonic]

Have you tried updating your soundcard drivers?

Anything in the Windows event log?

I think you're barking up the wrong tree with port forwarding etc, it's more likely to be hardware/software/drivers than a network problem.

[smilodon]

I've had the exact same problem with some games. The problem was not network related.

The first time it was my mouse driver, go figure? The second time was on HL2 and WOW. It was down to a sound driver. The worry was that the sound driver (an Audigy 1 card) was the new update. Going back to an older driver fixed it for me.

[kregoron]

I had this isssue with my old nVIDIA cards, i got rid of it by rolling back to a 187.xx based driver

[Jabbs]

:withstupid:

Rollback might sound weird but try it :g:

[Zootoxin]

EDIT: L4D and DODS tested and working with new(old) drivers

Does anyone know where I can find a full of every driver released for Geforce 9 series as I would like to get as late as possible.

I will let you know how further testing goes.

I guess with the new OS, Router and ISP I overlooked the obvious.

Thanks for the tips and pointers

[kregoron]

http://downloads.guru3d.com/Videocards---NVIDIA-GeForce-Vista-32|64_c32.html