The latest password recovery tool I've found is a program that's actually been around for quite a while. It's called Offline NT Password & Registry Editor and it's a free tool that resets your Windows password. It works a lot like PC Login Now, a previously-free program (now it's around $40) that also resets your logon password.
Ophcrack seems to be the most popular password recovery tool but if that doesn't work for you, give Offline NT Password & Registry Editor a try. It's a bit harder to work than Ophcrack with but it's certainly worth the effort if haven't found a way in to your PC.