Recurring BSOD problem. minidump files attached

I have been experiencing this recurring BSOD problem and lack the ability to diagnose it. I have updated drives and was going to update the BIOS but when reviewing how... it was advised against it. I am more than happy to do it if you think it will help.
I am running the following equipment
AMD Athlon 64 X2 Dual Core Processor 5000+
2.61 GHz. 4 GB RAM
NVIDIA GeForce 9600 GSO
Gigabyte S Series GA-MA78GM-S2H
Turtle Beach Riveria Sound Card

Thanks in advance for any insight into my BSOD problem and how I might go about resolving it.

 

Hmm, the only thing I see in common with these 4 differing BSOD's is that they all have a networking driver implicated: mrxdav.sys in 3, nic1394.sys in 2, tcpip.sys and RDPCDD.sys in 1 dump each.

I'd look to update all networking drivers first - if you're sure the PC is free of malware.