1. Open the registry and find this key and value, if they don't exist already create them.
2. Modify the value of 'DcacheMinInterval' to equal the new cache time-out.
Key:[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
Value Name: DcacheMinInterval
Data Type: REG_DWORD
Data:120-86400 (decimal) (expressed in seconds)
More info: http://support.microsoft.com/support/kb/articles/q160/8/39.asp
