If you are handy with Mysql you can go into there and select “USERS”. Im not sure if WP encrypts, I would suspect not. You can get eth username and password from there or change your email address.
Or… Is there a file that can be reinstalled that wil wipe out just the log in feature? Im not to hip with WP.
I had the same issue but realized I logged in as ADMIN originally and after re-gaining an interest in my blog had forgotten that although the uername is Admin I made it show as MILKFED from the profile… I have to log in as ADMIN though, not Milkfed.
Sorry if none of this was any help…