Windows 7 system won't start (blue screen error)

Hi all,

I'm facing a serious issue with my system - it won't load windows and hits a blue screen error (See attached) every time I load.

I suspect it's a hardware issue because I've had symptoms for a while. Below I'll describe symptoms and what led to the issue, and what actions I've taken so far.

Symptoms

• when playing some performance intensive video games, computer freezes or video driver crashes (crashing the game)
• I have 12 GB of RAM in the system but when it was working it only detected 6GB of workable RAM
• Every so often it would face issues when booting (would freeze during windows booting up). After several restarts it would be fine
• The last couple of months it's been fine, only crashing a couple of times but otherwise no issues

What led to these issues

• I decided to try and get the system to use its full 12gb (after only detecting 6gb). I did this by going to msconfig -> tools -> advanced -> 'maximum memory' set to 12
• I've done this before and it's worked. For a while the system detects 12 gb of RAM, but eventually it goes back to 6GB

Steps taken so far

• Boot in safe mode
• system restore from last save point (a few days ago)
• Removed each RAM module in turn to see if it was one of these (it wasn't, issue occurred on all configurations)

None of these worked.

If anyone could help me identify the issue, it'd be great. The decision I need to make is basically do I try to repair this computer or get a new one (current system is 5 or 6 years old so degradation is expected)

thanks a lot for your help

Rich