I forgot my own password for the Boot Camp partition on my MacBook Pro, I'd been letting it sit unused so long it just never had a chance to gel with me.
Well, it turns out the trusty "Offline NT Password & Registry Editor" is still fully functional with Windows 7, so I downloaded the appropriate ISO, burned it to a CDR, and minutes later I had access to the system
Holding down alt/option to select the boot disk at startup allowed me to choose the CDR I had burned, though it did not detect my keyboard, plugging in an external made everything work smoothly from that point forward.
A handy tool in a pinch when you're locked out of your own OS.
We ran into a machine that would absolutely refuse to boot the NT Offline Password Reset, even chain-loading with rEFInd, so the next logical step was to just do it from MacOS by compiling chntpw.
It's a bit of a pain, so to save you the trouble you can download precompiled binaries I made right here.
This was compiled on OSX Yosemite 10.10.3 but should theoretically run on 10.6 and higher.
./chntpw -i -L /Volumes/BOOTCAMP/Windows/System32/config/SAM