password expiration

I assume you have win XP Pro.
Start/Programs/Administrative Tools/Local Security
Policy/Account Policies/Password Policy. In the right
pane, right click, properties, modify (use accordingly).
And Start/Programs/Administrative Tools/Computer
Management/Local Users and Groups/Right
Click "User"(intended)/Properties...Or with Admin
privileges, at a command prompt type: net
accounts /maxpwage:unlimited.