Vista 64 bit got error 0x00000050 will not boot!

[keep_usa]

Please Help! Vista 64 bit will not boot in normal mode nor safe mode. Only come to Blue Sreen even boot with DVD to repair, but only come to error 0x00000050.

My System:

Quad 66
4 GB RAM
Nvidia GTS8800 640 MB Video
Mobo DFI LPI X48
Creative Fatal1ty Soundcard

Dual boot with 2 SATA HDD:

1-Vista Home Prem 64 bit
2-XP Pro. 32 bit

I changed boot option from the BIOS each time I need to run Vista or XP.
The XP is running fine. but when I want to boot to Vista I will get to splash screen and I can hear the fan speed up like Windows is ready to load, then I get the blue screen instead. Anyone have any ideas? I just need to get it boot up and save all my important files and probably reinstall it. Thank you in advance for your help!
Appreciate all your help!

(I am using my other XP system to post this thread)

Keep_usa

 

[Spd2Last]

Were you able to boot fine before with Vista? Try booting it up with only 2GB of RAM, then let us know how it goes.

 

[motarola2]

run checkdisk, that BSOD normally is hard drive related. sometimes other times OS or memory.

 

[keep_usa]

Yes, it has been running smoothly since I installed it last four weeks.

 

[keep_usa]

Tried 2 GB of Ram, same result.

 

[keep_usa]

How do I run checkdisk on Vista? Did you mean through DOS? Instruction please?

 

[johngalt]

Run the following in a CMD window:

chkdsk /f