Random Daily BSOD latest is APC_INDEX_MISMATCH

I have a customer running an intel based Windows 7 Pro x86 system with 6gb of memory. Onboard video and no attached peripheral devices. Standard usb mouse and keyboard.
Over the past month he has been getting BSOD at least once per week, and more recently it has become daily. Each time the BSOD is a different message in the dmp file.
I have loaded all the latest drivers from the manufacturer and from intel directly as well. The BIOS has also been updated to the latest. McAfee AV was installed until yesterday when I removed it.
Upon first boot this morning from a cold start, I received a BSOD showing 0x0000007f

Attached are all the files from the SF Diagnostic.

Please help me out :)

ROLSEN74, An APC index mismatch bugcheck is a very rare one. As far as I have noticed, it is caused by a third party security program, and removing them usually solves the issue.

Code:

96e1f29c  8b7ba998Unable to load image \SystemRoot\system32\drivers\mfehidk.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for mfehidk.sys
*** ERROR: Module load completed but symbols could not be loaded for mfehidk.sys
 mfehidk+0x64998

You have McAfee installed, which is a very common and widely found cause of BSODs. If it is present in the system, it make a lot of troubles. Not only BSOD, but also network troubles and a lot. Uninstall McAfee Using McAfee Removal Tool. Use Microsoft Security Essentials as your antivirus with windows inbuilt firewall, and free MBAM as the on demand scanner.
Download, install and update those, and then run full system scans with both of them, one by one.

Free up the startup.

1. Click on the Start button
2. Type “msconfig (without quotes), click the resulting link. It will open the System Configuration window.
3. Select the “Startup” tab.
4. Deselect all items other than the antivirus.
5. Apply > OK
6. Accept the restart.

Let us know the results.

Arc is right about McAfee, but in case this is a corporate PC I guess you'd have some restrictions on removing some programs?

Also, to make use of all 6 GB RAM, you'll have to do a fresh install of the 64 bit Windows 7.

Yup, the code highlighted in red..
Here's the description: Driver Reference Table - mfehidk.sys

Upload a screenshot of your hard disk using CrystalDiskInfo:

• CrystalDiskInfo - Software - Crystal Dew World
• Screenshots and Files - Upload and Post in Seven Forums

Make a hard drive test from the hard drive manufacturers website:

• Hard Drive Diagnostic Procedure

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

• Disk Check

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.

   Information

Errors are sometimes found after 8 passes.

   Tip

Do this test overnight, before going to bed.

If Memtest86+ does not find any errors with ram run Windows Memory Diagnostics for 7-8 passes following its tutorial: Memory Diagnostics Tool

You can change the hardware, but before doing that, check the software part one more time. 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.