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Stop Code: STOP 0×0000007B
INACCESSIBLE_BOOT_DEVICE
Code Meaning:
Caused when Windows loses access to the system partition during the Startup process. This can be caused by: an incorrect driver for a SCSI, RAID, or UDMA IDE controller; incorrect ARC path in the Boot.ini; or a failed boot device.
Recommended Resolution:
Verify that the disk storage device is installed correctly and working. Reinstall or update the device driver. Verify that the BIOS setting for the device is correct. Verify the integrity of the hard disk.

Stop Code: STOP 0×0000007F
UNEXPECTED_KERNEL_MODE_TRAP
Code Meaning:
Caused when the CPU generates an error that the kernel does not catch. Usually hardware related—especially RAM. Can also be caused by CPU overclocking, or defective components on the motherboard. Recommended Resolution:
1. Run the memory diagnostic to test RAM.
2. Restore overclocked settings to previous values.
3. Repair/replace the motherboard.
4. Disable sync negotiation in SCSI BIOS; check SCSI termination.

Stop Code: STOP 0×000000D1
DRIVER_IRQL_NOT_LESS_OR_EQUAL
Code Meaning:
Occurs when the system attempts to access pageable memory at a process IRQL that is too high Recommended Resolution:
Very similar to STOP 0xA. Remove, disable or stop the offending drivers, backup utilities or anti-virus programs. Get updated software from the manufacturer.

Stop Code: STOP 0xC000021A

STATUS_SYSTEM_PROCESS_TERMINATED
Code Meaning:
Caused when the user-mode subsystem (Winlogon or CSRSS) is fatally compromised and security cannot be guaranteed. The most common causes are third-party applications or mismatched system files.
Recommended Resolution:
1. Remove, disable, or roll back any newly-installed device driver.
2. Uninstall any newly-installed software.
3. Use Windows-compatible backup/restore programs.
4. Restore full control permissions to the local SECURITY account on the systemroot folder by doing a fresh parallel installation of Windows on a separate partition.