You can’t view the users passwords in AD as they are encrypted, typically with a one way encryption. Your best bet would probably be to simply change all the accounts to be required to change their passwords on next login.
There is small tool LC5, which helps to overcome your problems. It is compatible with Windows NT/2000/XP/2003. Though you didn’t mention here which flavor you are using!
Alternatively, you can create an admin-level account (or if exists) in windows domain.
Now download PWDUMP3 (from SearchEnterpriseDesktop)
and run this, and try to connect to a domain controller and extracted the password hashes.
Again, download a small tool called CAIN from here.
and run to extracted hashes (which is made text file) by this CAIN SW. Now it extracts all passwords or reveal weak passwords. (Remember, this method is bit tricky and take care)
Another, there is a very good guide about almost the same problem, which Mr. Labnuke, already discussed and answered. Please visit here for this guide…..