Windows XP constantly crashing...

I have a problem with my Windows XP in that it is constantly crashing. I have noticed a pattern to when it crashes, and that is when I am using Bit Torrent or Soulseek. Though it has crashed at times when neither of those program were on, it is extremely rare.

I am using Windows XP Pro SP1 with all updates (except SP2).

Originally, I thought this might have been a hardware problem, what with the RAM (Patriot 512 MB DDR PC2700), or the Motherboard...but I've replaced my RAM Stick and the problem still occured, changed my Motherboard completely, and it's still occured...therefore, I am forced to consider this as a software problem now, rather than a hardware problem.

I have updated my Network drivers recently, as I am told that could be the root of my problem, but updating it has done little to fix the problem. Do you have any ideas what the root of the problem could be, and how I could solve it?

NOTE: I have an updated AVG Free Virus Scanner all updated, as well as Adaware and Spybot, and run them regularly, so I do not think this is related to viruses/adwares.

Thanks.

Sure...

Pentium 4 2.60 gHZ
512 DDR RAM PC2700
120 gig HD
Radeon 9600 XT Graphics card
I have an Abit IC7-G Motherboard (brand new)
Windows XP Pro SP1
I'm using Firefox, not IE

I am connected to the internet thru a Speed Stream DSL modem that SBC DSL provided me with, and I am not connected through any network.

Yesterday, I was downloading Half Life 2 thru Steam, and that's about a 3 gig+ download, no problems. I've downloaded files near 200 mbs without using Bittorrent, and they seem to download fine, without any trouble.

My windows is set to ignore Blue Screen of Death, and just go straight to the restarting, but when I DO set it to show an error message, this is the one I most commonly get:
Stop: 0x0000007F (0x00000000, 0x00000000, 0x00000000, 0x00000000).

I've recently switched my motherboard, because the old one fried.

This problem was occuring on the old Mobo as well as the new one...

And I am not overclocking either.
<P ID="edit"><FONT SIZE=-1><EM>Edited by daoster on 11/30/04 07:44 PM.</EM></FONT></P>