At a loss with lag

Firstly I would like to say this is not a new problem, this is one I've been putting up with for about 6 months now, it's only just gotten extremely bad now.

But now to explain;
I only call this lag because I have absolutely no idea what is going on but whenever I attempt to go into a mission or arena as soon as the counter hits 0 my screen freezes and the sounds begin looping, this happens for around 10 seconds before the game catches up, this also affects background applications such as Ventrilo.

The only reason I can't put up with this any longer is because I am sick of having to put up with it every time I want to do a lot of arena.

My system is not exactly "Top of the line" but it keeps the computer going without any lag whatsoever, apart from perhaps a few overcrowded districts.

My System(dxdiag):

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System Information
------------------
Time of this report: 10/19/2008, 20:28:23
Machine name: HOWTOPWN-D827DA
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_rtm.040803-2158)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: BIOS Date: 10/14/05 14:04:20 Ver: 08.00.09
Processor: AMD Athlon(tm) 64 Processor 3000+, MMX, 3DNow, ~2.0GHz
Memory: 512MB RAM
Page File: 308MB used, 937MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
---------------
Display Devices
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Card name: RADEON 9250
Manufacturer: ATI Technologies Inc.
Chip type: RADEON 9250 AGP (0x5960)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_5960&SUBSYS_004C1043&REV_01
Display Memory: 128.0 MB
Current Mode: 1024 x 768 (32 bit) (60Hz)
Monitor: Plug and Play Monitor
Monitor Max Res: 1600,1200
Driver Name: ati2dvag.dll
Driver Version: 6.14.0010.6614 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 5/4/2006 05:51:00, 258048 bytes



I really hope somebody knows anything about this problem, because until now, no one has been able to help me.

Let's test something shall we?

Download and run this:

http://www.pcworld.com/downloads/fil...scription.html

Run it in troubleshooting mode. Mainly, the fibonacci numbers test will be the best determination of CPU stability in a game.


Also, please download this and post your voltages and temperatures from the sensor area under Computer.

http://www.majorgeeks.com/download4181.html

We can go from there once we have that info.

Let's test something shall we?

Download and run this:

http://www.pcworld.com/downloads/fil...scription.html

Run it in troubleshooting mode. Mainly, the fibonacci numbers test will be the best determination of CPU stability in a game.


Also, please download this and post your voltages and temperatures from the sensor area under Computer.

http://www.majorgeeks.com/download4181.html

We can go from there once we have that info.

Temperatures
Motherboard 35 °C (95 °F)
CPU 50 °C (122 °F)
Aux 48 °C (118 °F)
Seagate ST3120814A 37 °C (99 °F)

Cooling Fans
CPU 2909 RPM
Chassis 2836 RPM

Voltage Values
CPU Core 1.29 V
+3.3 V 3.20 V
+5 V 5.32 V
+12 V 12.86 V
+5 V Standby 4.75 V
Debug Info F 77 74 FF
Debug Info T 35 50 48
Debug Info V C0 EC C8 C6 C9 E0 E1 (03)

P.S: I don't know how to use the CPU stability thing, I ran it in troubleshooting but I had no idea of what it was actually doing. :s