spoolsv.exe is a service/windows application na nagsasabing may mga pending printing jobs ka.
I restart mo yung machine mo tapos tingnan mo sa Task Manager -> Processes Tab kung ano ang CPU Time nang Spoolsv.exe na service.
There are a lot of discussions in the net na pag nag 100% ang CPU time nang Spoolsv.exe mo sa Task Manager, more likely na may virus/spyware yung machine mo.