Unable to boot in DOS to change GPU's BIOS, help!

[Guest]

Hi all, this seemed like the most appropriate place to post this so here goes.

I've tried just about every DOS boot disk with a flash drive possible in order to change my GPU's BIOS in DOS - but the problem, I can't boot up with DOS no matter what I try as I always get the problem 'NTLDR missing', everytime.

What can I do about this? my operating system is Windows 7 64bit and i've googled my ass off trying to find a solution but found myself nothing but a massive migraine in doing so.

Again as i've said I've tried various DOS boot disk guides, setup files etc etc but none of them work as I just get 'NTLDR is missing'.

Any help on this would be reaaaaaaally appreciated, it's doing my nut Thanks.

 

[saaiello]

Did you go into the bios and change the flash drive to first in the boot priority?

 

[Guest]

Aye, aswell as selecting USB from the boot menu i've set USB (removable device) as first priority, to no avail.