Multi-Tasking Problem (Blue Screen of Death)

I need some kind of help here. Everytime I’m multi-tasking, like downloading using torrents while watching videos while downloading from the internet browser, and a lot more, I always get a blue screen of death, then it restarts. Also in gaming, while im downloading something from the net, while waiting for it, I tend to play, then while playing, I get that blue screen of death again. How do I fix this?

Comp Specs:

Intel(R) Core™2 Quad CPU Q8200 @ 2.33Ghz (4 CPUs)
2048MB RAM
NVIDIA GeForce 9800 GT 1Gig
HD Audio Rear Output 2 VIA Technologies

When a bluescreen occurs, the corresponding minidump file should be created in Windows\Minidump folder.
Can you supply a recent one?

I just uploaded it in rapidshare cause the attach file here only accepts certain extensions…so here,

http://rapidshare.de/files/47603050/Mini062009-02.dmp.html

In XP/Vista, there are useful information into Control Panel > Administrative Tools > Events, specially ‘Errors’, can you post the error number of the BSOD? Something like 0x00000000 (just that instead of zeros, could have numbers and letters).

The dump shows a memory corruption inside rohanclient.exe process… but where/how it occurred, I don’t know.
I’m afraid that’s a question for somebody more experienced with dumps than me…

@Tech

The Minidump was when the BSOD occured right? Since the minidump I uploaded is on 6/20/2009, the error log in the “Events” should be in the same date right? Problem is, the latest date in the errors list is 6/19/2009. Since I dont know alot on these errors, I’ll just upload a picture of my error logs…and somethings not right lol. There’s ALOT of errors. take a look:

http://img268.imageshack.us/img268/3554/errors1.jpg

http://img268.imageshack.us/img268/3884/errors2.jpg

somehow the pictures are useless, but I found the 0x00000000 thing Tech was looking for…here:

0x00000050 (0xE3FF474, 0x00000000, 0x00000000, 0x00000001)

This is the one I found on the blue screen of death.

Besides Google 0x00000050 also you can use:
MS knowledgebase: http://support.microsoft.com/search/?adv=1
Free memory tester (Run it overnight): http://www.memtest86.com/
Error explanations: http://www.xptuneup.com/xptuneup_stopmessages.htm
BSODs: http://www.techmetica.com/howto/descriptions-and-fixes-of-blue-screen-of-death-bsod-crash-errors/

Ok. I’ve been reading a lot on other forums, even memtest86 technical info…

Here’s the zip file of the recent minidump, and a pic of the dxdiag of my comp specs.

http://img523.imageshack.us/img523/2512/systemf.jpg

EDIT:

I ran Memtest86 just a while ago, and it only lasted 4mins…and there were 2 errors on Test 5…Here’s a pic:

http://img11.imageshack.us/img11/5739/cimg1123.jpg

http://img40.imageshack.us/img40/9525/cimg1125s.jpg

what does this mean? lol.