Clock Settings
Change from 24-hour mode to 12-hour mode
1. Go to Start -> Control Panel. Switch to Classic mode for more options.
2. Click on “Regional and Language Options”
3. Click on “Customise”
4. In the Time tab, look down to Time Format and on the drop down menu next to it, select hh:mm:ss tt.
5. Click “Apply” and “OK” to save the settings.