Crashes once week to a blue screen

Question

The PC crashes for example while reading a webpage and displays a blue screen that Windows has found error and shutdown to prevent damage, then it reboots. Happens randomly perhaps once every week in the last months. Drivers are checked.
Event manager shows these:
Error 20/03/2015 10:05:48 WMI 10 None
Event filter with query "SELECT * FROM __InstanceModificationEvent WITHIN 60 WHERE TargetInstance ISA "Win32_Processor" AND TargetInstance.LoadPercentage > 99" could not be reactivated in namespace "//./root/CIMV2" because of error 0x80041003. Events cannot be delivered through this filter until the problem is corrected.
Error 20/03/2015 10:05:44 Ntfs 137 (2)
The default transaction resource manager on volume System encountered a non-retryable error and could not start.  The data contains the error code.
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Answer 1

I'm no expert, but over several months I've been pursuing the cause of a similar problem, so I will offer what I have learned so far about troubleshooting such an issue.
First, get the following little tool: BlueScreenView.exe [http://www.nirsoft.net/utils/blue_screen_view.html].  It's free [unless you do the right thing and offer a donation ] and it will allow you to get the offending filename -- it will be highlighted in light salmon [i.e. pink].  Try Googleing that -- or update this Post with the information it shows [if you double click on the row, it will popup a cool little window with all the information -- copy-paste from there, or take a screen shot, etc.
OR, if you don't want to risk installing "unknown" software, there's a way to get windows to pause at the BlueScreen, so you can write stuff down.  I currently have Win 7, so I will give the instructions for it -- If your Operating System is different, the instructions may or may not apply and a Google session may be in order [search on things like "How to configure system failure and recovery options in Windows".  But, for Win 7:
 Click on the "Windows" button [used to be the "Start" button] [or hit the "Windows" key].
Click the "Control Panel" button.
Make sure the thing is sorted by "Larg Icons" [upper right corner].
Find the "System" icon and click it.
Click on "Advanced system settings" [left panel].
Select the "Advanced" tab [I guess that's "Advanced Advanced" or SUPER Advanced ]
Click on the Settings button in the "Startup and Recovery" group [bottom most].
In the "System Failure" group, make sure the "Automatically restart" box is unchecked.
Or, if you have a digital camera [smart phone is great for this], whip it out and grab a snapshot of the blue screen.
In my case it's a memory issue, so I used the Windows memory test to determine that my case is kinda weird -- still working on it [memory fails when populated to 8GB but not to 4GB -- same memory different capacity!].
Another possibility is a bad driver.  This can be due to a driver that needs to be updated, or it was just implemented badly, or some other manufacturers driver is installed [e.g. an nvidia driver for an ATI video card or a Linksys driver for a D-Link card, etc] or it's malware [typical for malware to replace a driver and not function well, thus causing Blue Screens.  Malware removal software should detect such things, but it's been my experience that one version of "Antivirus" [AV] will catch things that another won't and vice versa. 
BlueScreenView may help in determining which driver.  Again, try Googling the filename it indicates the Blue Screen occured at [Salmon colored] -- amazing the info/help you can find.