[CentOS] [OT] recover/reset 'owner' password on win7 os

i inherited a toshiba satellite l455d with win7 installed, install cd lost.

'owner' passworded, forgotten by previous owner. 'guest' is does not have a password.

i want remove unneeded music software and files and other crud before i defrag the drive so as to have more room to dual boot linux.

i would wipe win7, but not an option at this time.

i booted laptop, pulled 'ntpassword', copied files to a usb stick, tried to run;

X:syslinux.exe -ma X:

as 'guest', it failed.

how can i make usb stick bootable from linux?

any/all suggestion/help is greatly appreciated.

thanks in advance.