BSOD at random times

Multiple bugcheck codes, but pointing to the display driver 337.88 WHQL.

Code:

BugCheck 116, {fffffa8006b2f4e0, fffff8800fa1ed1c, ffffffffc000009a, 4}

*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
Probably caused by : nvlddmkm.sys ( nvlddmkm+98bd1c )

Followup: MachineOwner
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Code:

BugCheck D1, {10, 2, 0, fffff8800f0c6fdc}

*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
Probably caused by : nvlddmkm.sys ( nvlddmkm+dfdc )

Followup: MachineOwner
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Try to roll it back to the earlier version that worked good for you.
Device Manager - Roll Back Driver

Also, update the driver to DW1525 WiFi card from Dell: Product Selection | Dell US
Update the onboard Realtek network: Realtek

Let us know the results.

This time the BSOD crash dump is not very informative.

Code:

BugCheck A, {fffffa80908be9c0, 2, 0, fffff8000331001c}

Probably caused by : ntkrnlmp.exe ( nt!CcLazyWriteScan+188 )

Followup: MachineOwner
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Test your RAM modules for possible errors.
How to Test and Diagnose RAM Issues with Memtest86+
Run memtest for at least 8 passes, preferably overnight.

If it start showing errors/red lines, stop testing. A single error is enough to determine that something is going bad there.

If it does not show any error, enable Driver Verifier to monitor the drivers.
Driver Verifier - Enable and Disable
Run Driver Verifier for 24 hours or the occurrence of the next crash, whichever is earlier.

   Information

Why Driver Verifier:
It puts a stress on the drivers, ans so it makes the unstable drivers crash. Hopefully the driver that crashes is recorded in the memory dump.

How Can we know that DV is enabled:
It will make the system bit of slow, laggy.

   Warning

Before enabling DV, make it sure that you have earlier System restore points made in your computer. You can check it easily by using CCleaner looking at Tools > System Restore.

If there is no points, make a System Restore Point manually before enabling DV.

   Tip

• If you fail to get on the Desktop because of DV, Boot into Advanced Boot Options > Safe mode. Disable DV there. Now boot normally again, and try following the instruction of enabling DV again.
• If you cannot boot in Safe mode too, do a System Restore to a point you made earlier.

Let us know the results, with the subsequent crash dumps, if any.

Also, as teh computer was long time in use before throwing the bugcheck, the question of heat becomes uppermost. Is the computer hot? Report us the heat of the computer after a couple of hours of your normal usage. Upload a screenshot of the summery tab of Speccy. Alternatively, you can publish a Speccy snapshot too: Speccy - Publish Snapshot of your System Specs .

I suggested you to run driver verifier if memtest does not show any error. :) When memtest shows at least one error, no more troubleshooting is required. Now it is the time to search for the source of the RAM issue.

Now follow the "Part 3: If You Have Errors:" of How to Test and Diagnose RAM Issues with Memtest86+

Errors/red lines means one or more RAM is faulty. But the fault may occur due to a faulty DIMM slot, too, which is a motherboard component. Using memtest86+, you can discriminate between a faulty RAM and a faulty motherboard.

How? Say you have two RAM sticks and two DIMM slots. You obtained errors at the test with all RAM sticks installed. Now, remove all the sticks but one. Test it in all the available slots, one by one. Continue the same procedure for all the available sticks.
How to make the inference that is it a RAM issue or it is a motherboard issue? Suppose you have got the result like that:

No code has to be inserted here.
It is a RAM, a bad RAM.

But if you have got a result like that:

No code has to be inserted here.
It is a motherboard issue. The particular slot is bad.

If the RAM is bad, change/replace the RAM stick with one having the exact same specs of the existing ones. But it is best to get a new kit.

For a bad slot, it is a motherboard failure. You may use the computer with that particular slot not occupied by a RAM stick.