You can see spooler subsystem app stopped working error in Windows Vista:

or in Windows 7:

You can fix this error using Printer Spooler Fix Wizard:
Spooler subsystem app stopped working most often appears when you are trying to print .pdf document or trying to add new printer using Add Printer Wizard. Here are some tips that will help you to fix this error.
Manual Instructions
Use manual instructions below:
1) Check if Print Spooler settings are on default.
Press “Windows” + “R” buttons on your keyboard and type in:
services.msc
Locate Print Spooler in the list of services, right-click on it and choose Properties in the menu:

Check if your General settings are as on the following picture.

Then go to dependencies tab and check if you have RPC and HTTP in the list:

2) Next step is to scan your PC with anti-virus software. Try True Sword Anti-spyware free trial:
3) If above steps still don’t help – go to Command Prompt:
Click Start, in the Start Search box, type command. A list of of matches will appear above. Right-click Command Prompt in Programs list, and then click Run as administrator.
In opened black windows type in:
net stop spooler
Wait for the message and type:
net start spooler
Use System File Checker
So you restarted your Print spooler and emptied current tasks. Try to print now. If still unsuccessful or you getting error when starting spooler – that means something still preventing spooler from running. It can be virus or corrupted files. Return to Command prompt and type in:
sfc /scannow
and wait until scan will finish. If it will give you the message that some files are corrupted but it will be unable to fix them do the following:
Determine which files could not be repaired by the System File Checker tool, follow these steps:
Open an elevated command prompt. Type the following command, and then press ENTER:
findstr /C:”[SR] Cannot repair member file” %windir%\logs\cbs\cbs.log >sfcdetails.txt
then type the following command, and then press ENTER:
edit sfcdetails.txt
Now you can see which files are corrupted and replace them. If you find this manual too difficult use Printer Spooler Fix Wizard to fix this error automatically:
Information provided by: Alexey Abalmasov
Download Fix Wizard





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