Please help - disconnects in raid instances

[svetoduh]

Until recently the game worked fine for me. I am not sure if it was after the latest patch, but I started to be disconnected during the boss fights in raids.
It happens every time in Maghteridon Lair, but not before the boss is engaged. As soon as he is, a minute or so, I start first to lag, and then I am D/Ced.
I can log back immediatelly, but it does not help, i am D/Ced again.
I tried everything i could remember of except reinstalling the game... disabling all addons, reducing quality of video & audio settings, deleting WTF and those other folders to get them refreshed, but it is happening again.
I should mention that the game runs smoothly when not in raid, even in 5 men instance.

I am simply without an idea what to do.

[Tunga]

Have you updated all drivers? Could be a specific texture/sound that's causing it.

[WatcherZero]

Magtheridon is one of those fights that stress your bandwidth and computer, if theirs a missed or slow server-client interaction it will dc you and quite often your computer could be struggling to keep up with all the information. The culprits usually raid mods but can occur on its own :P

[svetoduh]

I think I already said that I disabled all addons. Even with no addons, nothing changes. AS for the drivers, i updated nVidia video driver. What drivers could be critical to update?
My system info:
OS Name Microsoft Windows XP Professional
Version 5.1.2600 Service Pack 2 Build 2600
OS Manufacturer Microsoft Corporation
System Manufacturer ASUSTek Computer Inc.
System Model K8N
System Type X86-based PC
Processor x86 Family 15 Model 44 Stepping 2 AuthenticAMD ~2009 Mhz
BIOS Version/Date American Megatrends Inc. 1009, 9/6/2005
SMBIOS Version 2.3
Windows Directory C:\WINDOWS
System Directory C:\WINDOWS\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)"
Time Zone Central Europe Standard Time
Total Physical Memory 1,024.00 MB
Available Physical Memory 397.53 MB
Total Virtual Memory 2.00 GB
Available Virtual Memory 1.96 GB
Page File Space 2.40 GB
Realtek AC97 Audio onboard

[Kalos]

Drivers that are critical can be: Processor drivers, chipset drivers, sound drivers, network drivers, storage controller drivers, and any other peripherals you have that may be working in action with the operating system or the game at the time, such as special drivers for your mice or keyboard, or webcam even. It seems unrelatable, but I recently proved any driver can screw up stability, a simple webcam from Logitech had managed continuously destablise and restart a copy of Vista Ultimate, through it's lousy Vista drivers. Now you don't use Vista true, but it goes to show drivers of any hardware interact with the OS in ways we don't know, sometimes ways they even shouldn't do so.

From looking at your hardware, you haven't listed a graphics card; but you have listed a very unreliable sound card, an onboard motherboard sound card. Most are ok, but I've had lots of reports on AC97, nothing perticularly nice.