For a local account you can use any software that would edit the SAM file. I frequently use NTPWEdit (found in Hiren's Boot CD), but there are many others to choose from.
One thing to keep in mind is that you're going to have to boot from a disc or USB, that being the case, you may have to set the BIOS to allow "legacy boot".
You know, some kind of password editor would be an awesome addition to TechUSB (hint hint).