How many printers have you had on this computer? 

how many different drivers?

I tend to have more than one printer on my computers.  when a printer does not print, it tends to be because it is not selected as the default printer.  When i go to print, I need to make sure that the correct printer is showing up in the print box, or it won't print.

Here's another way to look at it: go to your start button, then open up the control panel.  In the control panel, find printers, and click to open it.  Look at the printers listed, and make sure the correct printer is checked as the default printer.  Close up the control panel.  see if that solves your problem?

I think that is where I would start first.