Does a registry key exist to toggle the PCI Lock setting in msconfig? Enabled then BSOD in Win7

[TRWars]

Does anyone know if a registry key exists for the "PCI Lock" setting in Msconfig? Or a way to launch Msconfig from the startup repair boot mode?

I recently got the BSOD in Windows 7 after my only change in system settings was enabling PCI Lock.
It now dumps me to startup repair, from which I can use CMD Prompt to open regedit. However I an unable to open msconfig to disable this one setting... (trying to launch msconfig prompts me that an administrator session is required)
I've tried Safe Mode, Last Known Good Configuration, and many changes in my BIOS trying to usurp the issue, but with no luck.
My last system image backup is from 18 months ago, although I know I can still recover all my files and do a fresh install, I'm trying to avoid that.
Any ideas?

 

[ur6beersaway]

Run command prompt as administrator. Right click.

 

[TRWars]

Run command prompt as administrator. Right click.

When I navigate to cmd, run as admin, then try launching msconfig (mind you this is all through the rough explorer menu I get from regedit) I get the following message
"You do not have sufficient privileges to run System Configuration. Please run this utility as a user in the Administrators group"
Being the only user, and the admin, and only having one access level listed when entering "runas /showlevels", I can't figure out how to gain the privellage a to make this method work.

 

[ur6beersaway]

Might be a easier way.To disable PCI bus IRQ steering, follow these steps: 1.Click Start, point to Settings, click Control Panel, and then double-click System.
2.Click the Device Manager tab.
3.Double-click the System Devices branch.
4.Double-click PCI Bus, and then click the IRQ Steering tab.
5.Click to clear the Use IRQ Steering check box, click OK, and then click OK again.
6.When you are prompted to restart your computer, click Yes.

If you click No instead of Yes when you are prompted to restart your computer, the changes are not applied.

http://support.microsoft.com/kb/182628

 

[TRWars]

Let me try to clarify,
All attempts at any changes and repairs are being made from the Windows Startup Repair utility which I then load the cmd prompt from.
Windows is not booting at all in a traditional sense.
So I have no access to start menu, control panel, device manager etc. (none of the associated services are running to launch these programs)

 

[zarrdemon]

Let me try to clarify,
All attempts at any changes and repairs are being made from the Windows Startup Repair utility which I then load the cmd prompt from.
Windows is not booting at all in a traditional sense.
So I have no access to start menu, control panel, device manager etc. (none of the associated services are running to launch these programs)

 

[zarrdemon]

just use your cmos clear and any changes made previously to the bios will be defaulted to their original factory state (i believe with no after purchase drivers that are installed onto the mobo itself) if you dont know what cmos clear is just look on your mobo for a set of 3 copper square pins with a small, blac, rectangle, piece of plastic around two of the three pins.take it off of pins 1+2 and put it on pins 2+3 (for 30 sec. i would say) then, return them to pins 1+2. This should help fix your problem. Once you can finally log on to windows immediately start the msconfig utility and uncheck PCI lock