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03-21-2011 04:59 AM
Its probably too late for you, but just in case..
You may not be aware that all late Windows OS have a hidden admin called Administrator which is only visible in Safe Mode. (Ever wondered why you can't call yourself "Administrator" - now you know!) It is used by maintenance people.
To solve your problem, boot in Safe Mode. Log in as "Administrator" - it has no password. Now you can reset the password, or delete and re-instate your normal (visible) admin.
By the way, you said you can only log in as Guest. If you always log in as admin, be aware that this is bad practice. It gives you much more access than you need for normal tasks, and along with that the ability to corrupt or destroy vital software, including the OS!
If you are the administrator or sole user of a computer, you should have two login names - one for admin, and another for all other uses set up as a normal user (no privileges), preferably with a different password.
Use that admin login only for those things that need it - installing new programs, updates, etc.
03-23-2011 12:59 AM
You can reset a lost or forgot Windows password with 4 methods below:
1. Another valid administrator account which can normally log on.
2. A password reset disk or a repair disc, which is created in advance ( before you lost password ).
3. Third-party software to create a bootable password reset CD/DVD or USB, like Windows Password Reset Tool .
4. Re-install. Will lose data.
07-25-2012 08:27 PM
I'm afraid you have to reset windows admin password , for nowadays, we can't know the current password without cracking.
Tutorial of Windows admin password reset: