Less Common Print Spooler Problems
Windows Registry Problems
You might also have some Windows Registry problems and I recommend getting a Registry Cleaner software and try to clean up your registry. This can also be a less common problem for the Print Spooler problem. If you think you might have a registry problem you could use something like AML Registry Cleaner and try to fix your problem. Restart the machine and see if this helped.
Malware and Spyware
This can also be a less common problem for the Windows 7 Print Spooler problems and you should always keep your system up to date with the newest updates from Microsoft plus install an anti malware software and scan your system frequently. I recommend Malwarebytes as it should take care of the newest threats. There are quite a few malware and spyware programs out there that would try to take advantage of the Print Spooler service in order to infect the system as the Print Spooler service is installed by default on all the Windows 7 machines and it's practically used by every user that has a printer.
Other problems may appear because of the incorrect document formatting, when you try to print an A3 document on an A4 paper without the proper scaling. A print job that might be too big for the printer spooler or trying to force the print of a Color document on a text only generic printer, a system that is too low on virtual memory and many others that usually would appear as an error or warning in the Windows Event Viewer.
If you experience problems when printing PDF files or if the printer pauses when printing this is a good sign of wrong drivers. It's well known that when printing PDF files the printer might pause for long time between the pages and it's because of the drivers. Try to replace the drivers with PCL5 drivers to see if this solves your problem.
In case of extreme failure and when you are really unable to solve the problems by replacing the driver or checking the printer settings, you can always try a system restore and see if that helps.