Try THIS if you have Windows XP >>>
Enable Military Time in Windows Vista
It's really very simple to enable the system clock to show military time in Windows Vista, but the setting is not in an obvious place, so you might not have found it.
To change this setting, we'll need to get to the Regional and Language Options screen. Open the Control Panel, then *click* on the "Regional & Language Options" globe icon. From the Regional and Language Options dialog, click the "Customize this format" button, and then select the Time tab.
Direct link to this tip is >>>
http://www.howtogeek.com/howto/windo...windows-vista/
/s/ Phred
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