A 'Factory-sealed' computer found with a virus

A client gave us a brand-new computer like this one, fresh out of the box. What we discovered when setting it up as a server was it had a virus. When we rang up, the company that supplied the equipment, they were puzzled too and claimed it was impossible as it was 'Factory-sealed'. So how and who put on the virus is a mystery?

Here is my suggestion to you scan your new computers for virus.