Is it worth updating?

[wngnutmv]

I've had my pc for several years, no complaints, but it needs to be updated or replaced. Money is tight so if I could update for a couple hundred bucks and make it last another years or so, that would be great. I do not use this for any hardcore games, but I recently bought German Truck Simulator and all I get is a mostly black screen when I try to play.
I'm no expert, so what do you guys suggest?

Here's the basic specs:
AMD Athlon XP
Windows XP Professional SP3 (Build 2600)

CPU Arch : 1 CPU - 1 Cores - 1 Threads
CPU PSN : AMD Athlon XP 2500+
CPU EXT : MMX(+), 3DNow!(+), SSE
CPUID : 6.A.0 / Extended : 7.A
CPU Cache : L1 : 64 / 64 KB - L2 : 512 KB
Core : Barton (0.130) / Stepping : ???
Freq : 1836.33 MHz (166.94 * 11)

MB Brand : Gigabyte
MB Model : GA-7VT600 1394

NB : VIA KT600 rev 80
SB : VIA VT8237 rev 00

GPU1 Type : RADEON 9200 SERIES
GPU2 Type : RADEON 9200 SERIES - Secondary

DirectX Version : 9.0c

RAM : 3072 MB DDR
RAM Speed : 166.9 MHz (1:1) @ 2.5-3-3-7
Slot 1 : 1024MB (3200)
Slot 1 Manufacturer : Noname
Slot 2 : 1024MB (3200)
Slot 2 Manufacturer : Noname
Slot 3 : 1024MB (3200)
Slot 3 Manufacturer : Noname

 

[SlitWeaver]

Recommended:
New motherboard*
New CPU*
New RAM*
New GPU
Upgrade to Windows 7 Professional.
*All three of these will need to be bought together because you have some very, very, very old parts that will not be supported by newer technology

If you need help piecing together a low-budget upgrade, I'm (and all of Tom's Hardware is) here to help!

Edit: A full replacement might be easier at this point...just by looking at all of your stuff. You can build very budget friendly PCs now-a-days (you can even use slightly older parts and save a few more extra bucks if you know where to look ).