DirectX files can become corrupted and as they are so tightly integrated with the operating system that the only real remedy is to re-install the os.
I am going to say that I may have to agree with Kemical's suggestion. It bothers me and I know bothers him as well when we are unable to find the actual culprit responsible but sometimes it happens and if and when system files become so corrupt that the system is unable to run reliably sometimes there is little to no other recourse.
I read this thread as well as your thread on the other forum a couple times. It is not however, clear that when your system hangs (with or without a Blue Screen) which monitor experiences the color / pixel distortions or if it is both. Normally I would associate this with a video driver problem or corruption somewhere in the subsystem and recommend troubleshooting DirectX
Diagnosing basic problems with DirectX but I suspect you are well past that.
It is also not clear whether or not your system exhibits these same symptoms without the external monitor connected.
You have one suspicious driver
X6va009 6/8/2012 I say suspicious because I can find anything regarding it in my normal driver reference databases and when I Google or Bing it, it doesn't look too good.
You have one very old driver
Kone.sys 12/11/2008 ROCCAT Kone Gaming Mouse
ROCCAT STUDIOS V3.0 - SUPPORT » Support - Mice » ROCCAT Kone this is way too old and since your issues seem to involve gaming I would suggest either update, upgrade, uninstall, remove device and rename driver to break it to Kone.OLD
Update your network adapter drivers
Rt64win7.sys 6/10/2011 from here
Realtek and
NETwNs64.sys 10/31/2011 Intel Wifi from here
Link Removed due to 404 Error While you are at it update your audio driver
RTKVHD64.sys 2/18/2011 from here
Realtek Finally and I am not sure this will actually address any underlying problem and I don't know how you are interfacing your external monitor with your laptop, but I would strongly recommend if you are using the HDMI interface port, that you use the best cable you can afford. Shielding is very import in HDMI cables and a poorly shielded cable can result in any number of problems. One of the reasons I was wondering if you ever experience the problem when the external monitor is not part of the equation.