A new Asus computer out the box had been setup with the region settings of English (United Kingdom) , however in some .net programs the date format still showed as English (United States)

This looks like a common problem with some Windows 7 Sysprepped Machines. To reset the date do the following

• Control Panel
• Region and Language
• Change the Format to anything else but English (United Kingdom)
• Click Apply
• Change the Format back to English (United Kingdom)

This should fix the problem