I've lost my set up cd and am having trouble downloading anything that assists me.

Here's the link to the Lexmark X4650 drivers: http://bit.ly/d4cHfz. Click on the Microsoft, Macintosh or Linux/Unix drop-down found below the page to choose the version of your computer's operating system. Download, execute the file and follow the instructions in the software. For further assistance, you can also contact Lexmark technical support. Thank you for choosing Lexmark.