1) It's Epson, not Epsom.
2) Just find the Epson support site. Thirty seconds with Google takes you to:
http://www.epson.co.uk/Printers-and-All-In-Ones/Inkjet/Epson-Stylus-CX6400/Drivers-Support;jsessionid=0C036402AE4E7198ECA449D18BE32308.acc4-new
Why, why why?, November 2011