BSOD Windows 7

Heya everyone,
I've been on this for months and its making my brain melt. So what we have is Bsod while playing games or just browsing the internet on Windows 7 x64 Home Premium full edition. I've been getting all types of blue screens that randomly point to system files and drivers. I've done a full format and reinstall of windows. Reset the cmos battery and cleaned out the inside of dust. I've installed only 4g's of ram and tested. Same thing. I've updated the bios, video driver, and chipset. I've run memorytestx86 for about 2 hours with no errors. I've unplugged all the usb devices besides the mouse and keyboard. Since I've reinstalled its crashed about 4 times. Some days it will crash every 5 minutes and others it can last a day. This is a pre-build with the following specs

Motherboard:ASUS P5QL/EPU LGA 775 Intel P43 ATX Intel Motherboard

Processor: Intel Core 2 Quad Q8300 Yorkfield 2.5GHz LGA 775 95W Quad-Core

Desktop Processor BX80580Q8300

Ram: G.SKILL 8GB (4 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Quad Kit Desktop Memory Model F2-6400CL5Q-8GBPQ

Hard Drive:Western Digital Caviar Black WD7501AALS 750GB 7200 RPM SATA 3.0Gb/s 3.5" Hard Drive -Bare Drive

PSU: OCZ ModXStream Pro OCZ600MXSP 600W ATX12V V2.2 / EPS12V SLI Certified CrossFire Ready 80 PLUS Certified Modular Active PFC ...

Graphic: EVGA 512-P3-N871-AR GeForce 9800 GTX+ 512MB 256-bit DDR3 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

Here's a list of the dump files I've had so far, but I'll keep them coming as the messages happen. I've gotten ntoskrnl.exe many times before the reinstall and cant find much on the stop code. Any help would be much appreciated.

I've debugged it, but I dont know what I'm looking at :P I see one of them has to do with the mouse, so possibly the usbport.sys and the mouse.sys is being caused by the mouse. It is plugged into the front of the computer so maybe I can mess around with that. While I was playing a game I went into the settings and as soon as I clicked Graphics, I got a blue screen. Maybe a video card issue. You guys are awesome at debugging these things, so I'm pretty excited to get this fixed.

Attachment 130120

I think really you'll be better off with the mouse plugged in to the back. Different plugs may possibly do different things, mine did. Nothing to do with your issue (maybe) but, it'll look tidier! And pick your dirty socks up!

Lecture over!! Now you need someone to look at your dump files

Stop Error 0x50

Usual causes: Defective hardware (particularly memory - but not just RAM), Faulty system service, Antivirus, Device driver, NTFS corruption, BIOS

I Think you need a better expert than I. Sorry I can't help.