Tenant Pro 7 requires that your Date/Time settings be set to standard American time settings.  If you are in a different country, you may have your Date/Time settings set differently.  If you experience the following error, this is more than likely the cause:

To correct this, you must change your Date/Time settings to be the same as this:

To access these settings in Windows XP, click Start > Control Panel > Date, Time, Language, and Regional Options > Regional and Language Options.  Then select the Date tab or Time tab to select the settings.

To access these settings in Windows Vista or Windows 7, click Start > Control Panel > Clock, Language, and Region > Change the date, time, or number format.