hey sheila you did not installed driver of your printer on your pc when you change your windows get you printer CD/DVD and install them or go to properties of my computer /this pc and choose device manager ==hardware and there you can see which drivers is not installed and update them i hop it was been helpful.
well Melissa do u have any anti-virus on your computer if you havn't i think your computer is viruses 'n needs to install some Anti - virus. second if you installed any virus program so maybe your computer ram is less than that he says to you right-click on the my computer or this pc and choose properties 'n the you can see your computer informs. your prob have many reasons but these are is important of another . i hope that was helpful for you.