BSOD before welcome screen in Vista!

Hi, I'm getting a blue screen of death when booting windows vista which occurs before the welcome screen shows up. The stop error message is as follows:

***STOP 0x0000007F (0x00000008, 0x8014B000, 0x00000000, 0x00000000)

It also says about checking my memory for errors, video card etc etc and general hardware stuff which does not seem to help.

Some facts about the setup of my pc:

I'm running a dual boot of 2 operating systems, with 1 hard drive with windows xp pro, and the other hard drive with windows vista ultimate. Windows XP works perfectly (so this rules out the hardware problems I think) and the problem is occuring with windows vista only.
I thought it was due to some software changes I made as of late, the 2 main ones I can think of were:
1) Installing a new version of my antivirus (NOD32 v3)
2) Attempting to patch tcpip.sys to remove the concurrent connections limit

What I've tried so far:

In safe mode:

1) Undo all the changes I've made to tcpip.sys and restoring it back to the original.
2) Uninstalling NOD32 v3.
3) Cleaning with CCleaner
4) Uninstalling my ethernet cards drivers

From the other OS (Windows XP):

1) Full in depth system scan with NOD32 v2 of both hard drives.
2) Attempting to look up similiar BSOD's with my stop error which all relate to hardware problems, but I'm pretty sure its something to do with software but can't figure out what.

Strangely enough I can only access safe mode, safe mode with networking gives a BSOD (the same one), normal boot gives a BSOD, last known configuration does not work either.

Hardware Specifications:

Gigabyte GA-K8N51GMF-9 Socket 939 Motherboard
AMD Athlon 64 3500+ (Socket 939)
2x1GB DDR400 Corsair RAM
Maxtor 6G160E0 160GB S-ATA Hard Drive (with vista)
Maxtor 6Y080P0 80GB IDE Hard Drive (with xp)
Nvidia Geforce 7600GS (Manufacturer Overclocked to 1.55GHz effective memory clock, and 550Mhz core clock)
LG DVD Writer RAM Drive

Details about Windows Vista:

All updates installed
All drivers upto date.
Main software installed:

Adobe Photoshop CS3
Adobe Reader 8.11
Ares P2P 2.0.9.3030
Ccleaner
Brain Lara Cricket 2007
Daemon Tools 4.10
Command & Conquer 3 Tiberium Wars
eMule 0.48
ImgBurn 2.3.2.0
Internet Explorer 7
Java Runtime 6 (Update 3)
K-lite Mega Codec Pack 3.5.3
Limewire Pro
Messenger Plus! Live 4.23
Microsoft Office 2007
Mozilla Firefox 2.0.0.9
Nero Micro 8.1
Nvidia nTune 5.5
Realtek High Definition Audio Driver R1.80
Virtua Tennis 3
Sopcast 1.1.2
TVUPlayer 2.3.2.52
Windows Live Messenger 8.5
Windows Media Player 10
WinRAR 3.71

Would be most grateful for any help! If anyone needs any more info just ask! Thanks!