For Windows XP,
- Click on Start then select Control Panel.
- Select Date, Time, Language, and Regional Options and/or Regional and Language Options.
- The Regional Setting tab should be set to English (United States).
For Windows Vista/7
- Click on Start then select Control Panel.
- Select Clock, Language, and Region and/or Regional and Language.
- The Formats tab should be set to English (United States).
Also verify the date and time settings.