Start > Administrative Tools > Local Security Policy > Account Policies > Password Policy > set "Maximum password age" to "0"This method works on a domain controller:
Start > Administrative Tools > Group Policy Management > Forest > Domains > your domain name > right click "Default Domain Policy" under your domain name > Edit > Computer Configuration > Policies > Windows Settings > Security Settings > Account Policies > Password Policy > set "Maximum password age" to "0" > OK
/windows | Feb 28, 2012