Windows XP forum: Computer restarts when transferring large amounts of data

Hi,
I have been living with this problem ever since I built my computer and have finally decided to tackle it.

Whenever I transfer a large amount of data (>1GB), my computer restarts itself in the middle of the process. There isn't a definite amount - sometimes it will complete 2-3GB before it happens, sometimes it will happen after 250MB. I also noticed that it sometimes occur when I am continuously sending data, such as when I watch a video file on an external drive.

Each time it happens, I get a message upon Windows loading that says that the system recovered from a serious error. I look at the logs, but I can't make any sense of it.
This happens even when I am using a self-powered USB source, so I don't think it's a power supply issue. I have several ports, but changing the port doesn't make a difference. Any ideas would be really appreciated. Thanks

Here are my specs:
Windows XP Pro SP2
AMD Athlon X2 3500+
ECS KN1 Lite Motherboard
Antec NeoHE 430W PSU
2GB DDR PC3200
1 320GB SATAII HD
1 160GB IDE HD
Creative SoundBlaster Audigy2 ZS
ATI Radeon X1900
DVD burner

USB Devices:
IR receiver for wireless keyboard
Separate IR receiver/charger for wireless mouse
Printer
Self-powered USB hub
Self-powered External HD (have 2, but not used at same time, both fail)