Random freezes with no BSOD

Hi. I hope I'm posting this in the right place.

The problem I'm experiencing is that my computer is randomly freezing. By freezing, I mean that the computer completely locks up. No mouse movement, nothing. I'll try to give as many details as I can but if there is any further information that would help, please let me know.

First off, my machine has the following spec:
Alienware M17x R1
Windows 7 x64 Home Premium
Intel Core 2 Duo Mobile
NVIDIA GTX 260M
8GB DDR3 RAM
2, 1TB SSHDs

The freezing problem seems to occur randomly during usage, and I cannot seemingly force it to occur. It usually happens within about an hour or so of use, but can be as little as a couple of minutes or as long as a couple of hours. However there are a few important points. First, during the diagnostics I have run (e.g. Memtest86) I've not experienced any problems. Further, I've managed to leave the computer on overnight running malware scans without the issue occurring which leads me to believe that my interaction with the computer may be triggering the problem. I've not been able to narrow it down further than this, but it does seem to occur more when I'm making use of the internet (e.g. Google Maps, Apple Updater etc.).

When the computer freezes, I cannot do anything except power it off. I do not get a BSOD. About a second before the freeze happens, I notice massive lag. All music stops playing. However I am still able to switch the track pad on and off using the function keys. I also notice that shortly after the freeze, the fan starts, suggesting some kind of busy wait (deadlock?).

I first noticed the issue a couple of weeks ago. I'm not aware of having made any significant changes, although I did install a small program that claimed to stop Windows from restarting (it didn't really work). However I have since uninstalled this in case it was causing the issue.

In terms of what I've done so far to solve the problem, I started by doing hardware checks. However Memtest86 reported that my memory was fine and Seagate Dos tools reported the same for my SSHDs. I also ran a full virus scan with Malwarebytes but no problems were found. I ran a full disk defrag (Smart Defrag) and cleaned the registry (CCleaner) but neither solved the problem. I installed a Windows hotfix for a deadlock issue but that too did nothing. I read about some potential problems with different memory frequencies and some fixes possible through the BIOS. As my BIOS did not offer these options, I flashed the BIOS and updated to A7 (the latest) but the only result was to break my RAID 1 setup. Following the advice from other threads on these forums, I then switched on Windows Driver Verifier to try and force a BSOD. However whilst it was on, I just got another freeze with no BSOD.

I'm afraid at this stage I'm out of ideas so that why I'm here asking for help. In accordance with the advice in this sub-forum, I ran the DM Log Collector and have attached the results. However as I'm not actually getting a BSOD, I'm not sure if this will be of any help or not.

As I say, if there is any further information that would be of use, or if you have any advice on further diagnostics to try, please let me know.

Many thanks in advance for your help.

Hi Laurie, yes driver verifier will slow your system. If there is some bad driver it should cause a BSOD, if you get one, disable DV.

It sure seems like you're overheating. Have you blown out all the vents, use it on a hard surface?

One of the toughies, MS driver may cause a problem 1 in 500 times maybe, but you can enable them too. I don't know if you done all of these yet:

Some hardware tests to run.

Graphics card test:
Video Card Stress Test with Furmark

Hard drive(s)test(s):

Pick one for your HDD brand or use Seatools.
7 Free Hard Drive Testing Software Tools

RAM (memory) test:

This will require memtest on a bootable CD or USB stick.
RAM - Test with Memtest86+