BSOD for many reasons, mainly during long computer use.

Welcome to SF.

Lots of 1A (Memory_Management) errors.

I'd suggest to start with testing RAM first.

Take memtest. Run for 8 passes and test each stick in a know good slot for an additional 6 passes.

• RAM - Test with Memtest86+

The goal is to test all the RAM sticks and all the motherboard slots.

Check your motherboard manual to ensure the RAM sticks are in the recommended motherboard slots. Some motherboards have very specific slots required for the number of RAM sticks installed.

If you get errors, stop the test and continue with the next step.

1. Remove all but one stick of RAM from your computer (this will be RAM stick #1), and run Memtest86 again, for 7 passes.

*Be sure to note the RAM stick, use a piece of tape with a number, and note the motherboard slot.

If this stick passes the test then go to step #3.

2. If RAM stick #1 has errors, repeat the test with RAM stick #2 in the same motherboard slot.

*If RAM stick #2 passes, this indicates that RAM stick #1 may be bad. If you want to be absolutely sure, re-test RAM stick #1 in another known good slot.

*If RAM stick #2 has errors, this indicates another possible bad RAM stick, a possible motherboard slot failure or inadequate settings.

3. Test the next stick of RAM (stick #2) in the next motherboard slot.

*If this RAM stick has errors repeat step #2 using a known good stick if possible, or another stick.

*If this RAM stick has no errors and both sticks failed in slot#1, test RAM stick #1 in this slot.

4. If you find a stick that passes the test, test it in all the other motherboard slots.

If Part 2 testing shows errors, and all tests in Part 3 show errors, you will need to test the RAM sticks in another computer and/or test other RAM in your computer to identify the problem.

In this way, you can identify whether it is a bad stick of RAM, a bad motherboard, or incompatibility between the sticks.

Errors are sometimes found after 8 passes.
Do this test overnight, before going to bed.

Hmm. :) I noticed that myself but ignored cause there are situations when the user is asked to replace their internet security program with MSE or another security software, the suggestion is rejected.

You can do the following as well:

MSE is recommended from a strict BSOD perspective, compatibility & stability compared to other antiviruses/internet security software:-

1. Microsoft Security Essentials - Free Antivirus for Windows
2. Malwarebytes - Free
3. Good and Free system security combination.

Do not start the free trial of Malware Bytes; remember to deselect that option when prompted.

Run a full scan with both (separately) once downloaded, installed and updated.

Run the System File Checker. It allows the user to scan for and restore corruptions in Windows system files.

• 1. Click on the
  2. Type CMD on Search
  3. Left click and Run as Administrator
  4. Type SFC /scannow

Full tutorial here:

• SFC /SCANNOW Command - System File Checker

Run Disk Check on your hard disk for file system errors and bad sectors on it:

• Disk Check

Free up the start-up, nothing except the antivirus is usually needed.

• Startup Programs - Change
• Troubleshoot Application Conflicts by Performing a Clean Startup

By the way, does it BSOD in Safe Mode?

Sorry but:

System Optimisers

This software is a known cause of BSOD's. The windows 7 operating system does not require these registry cleaning software. They often tune-down rather than tune-up and can wreck the OS beyond repair. Microsoft have improved Windows 7 significantly and it is much better at organising and optimising itself than its predecessors. Check this, this and this thread for evidence.

If you feel the need to use a registry cleaning or optimisation software, most of us recommend the use of CCleaner but make sure you back up the registry before making letting ccleaner delete anything.

Test each stick individually and remove the faulty one.