Password Resets
Ultimate Boot CD for Windows (not the Linux one) has a few tools for resetting Windows passwords. I've used them in the past...
Dell Windows OEM "Administrator" password - apparently this is programatically generated and you can call Dell for it (never tried).
Sticky keys trick: http://4sysops.com/archives/forgot-the-administrator-password-the-sticky-keys-trick/ - kind of convulted
chntpw (which is probably the tool on the Ultimate Boot CD, original, not Windows one)
- http://pogostick.net/~pnh/ntpasswd/
Password Expiry
Set password expiry to never: net accounts /maxpwage:unlimited
Password Expiry Individual User Accounts
If you want to remove password expiration do the following:
run cmd.exe with administrator permissions.
wmic
UserAccount where PasswordExpires=TRUE set PasswordExpires=FALSE
Confirm change for each account with password expiration.
tags: password, nt, reset, administrator, expiry