looking for help with xp bosds

[jesses]

Hi there
I'm trying to figure out repeated bsods my computer has been suffering from. Its an older Athlon on an Assus a7v600. Its been crashing randomly for about a month now with a couple different error messages.
Here’s the details
No hardware upgrades
Ram passes Memtest
check disk found and fixed a bad sector after on of my crashes (problems persist)
Avg found a java bug,repaird (problems persist)
and I don't know what I'm looking at in the minidumps, If you could give me a hand reading them I sure would appreciate it (attached are the three that happened this morning).

Thanks