You will get the error "Printer Spooler Service is not running" when you try to add a new printer or open the printer when some thing wrong with your Print Spooler. Simple fix to this is to restart the Print Spooler service and make sure it is Start up type is Automatic.
Right click on "My computer"
Go to "Manage"
Expand "Services and applications"
Go to "Services"
Find the "Print Spooler"
Then Stop the Service and Start it again and change the service start up type to Automatic and the problem will be solved.