BSOD, Fatal System Error on Boot to Vista

My HP Pavilion Elite m9400t is booting to a BSOD in normal mode, safe mode, or even System Recovery from the BIOS. When I disable automatic reboot on system failure, I can see that this is the error :

STOP: c000021a {fatal system error}
The initial session process or system process terminated unexpectedly with a status of 0x00000000 (0xc0000034 0x00106e0). 
The system has been shut down.

When I run a diagnostic from the BIOS, i see at failure on the Boot path test. Here is that error :

Error Code  : BIOHD-4
Error : Uninitialized /corrupt boot structure detected.

I don't have a recovery CD, but I have Win7 PC that I can use to make disks or bootable usb drives. I know I should be trying to boot into a recovery mode and run some repair tools, but I don't know how to get there. Any help will be appreciated!!

It sounds like your system either has bad sectors on the drive, or a corrupted boot sector. Try downloading the Ultimate Boot CD and running some drive diagnostics on it.