Stop Windows Vista Password Expiration

1. Open the Start Menu.
2. In the white line (Start Search) area, type cmd
3. Right click the cmd.exe icon (black box at top of the program menu) and click Run as administrator.
4. Type net accounts /maxpwage:unlimited and press Enter. (See screenshot below)
5. If you get the the "command completed successfully" message you're done.

Hat Tip: User Brink
http://www.vistax64.com/tutorials/96092-password-expiration-vista.html