If you want to do this for all users, enter:
Start / Run / net accounts /maxpwage:unlimited
Added 3/18/02
If you are getting an error message that your password is about to expire:
Right click on the My Computer icon
Select Manage
Go to Local Users and Groups / Users
Right-click on the user you want to change
Select Properties
On the General tab, check Password never expires
Click OK
