What is STOP: 0x0000007B error

Sometime, I get this after booting, before entering Windows.

What does 0xF7BED528 parameter signify? I search Google and find result for 0x0000007B. But I cannot find something for parameter 0xF7BED528. What is this? Why it appears? What is it causing?

0xF7BED528 is the first parameter. You get the 0x0000007B STOP code with the important parameter 2 with 0xc0000034 which means device not found.

C:\Users\André>err 0xc0000034
# for hex 0xc0000034 / decimal -1073741772
  STATUS_OBJECT_NAME_NOT_FOUND                                   ntstatus.h
# Object Name not found.
# as an HRESULT: Severity: FAILURE (1), FACILITY_NULL (0x0), Code 0x34
# for hex 0x34 / decimal 52
  ERROR_DUP_NAME                                                 winerror.h
# You were not connected because a duplicate name exists on
# the network. If joining a domain, go to System in Control
# Panel to change the computer name and try again. If joining
# a workgroup, choose another workgroup name.
# 2 matches found for "0xc0000034"

This is caused when you change the SATA mode from IDE to AHCI without enabling the AHCI driver first.

Error message occurs after you change the SATA mode of the boot drive

http://support.microsoft.com/kb/922976