Essential Processes needed to run Windows

[Stealth]

Spoolsv.exe is by no means neccessary - the only thing it does is control the printer spooling subsystem.

[Bryce W]

By definition, I suppose its not 'essential', but it is required for 'normal operation'. You could also close off all your svchost.exe's as its not 'essential', however you would lose connectivity.

[ArticleBot]

When repairing a PC by either trying to shutdown a virus, trying to remove adware/spyware/malware or just trying to get a speed increase you need to shut down processes that run in the background. It is often nessessary to know the bare minimum processes which Windows needs to operate and it is sometimes difficult to know which ones are which, here is a list of the essential processes that Windows needs to run correctly.
Read the full article. (http://www.technibble.com/essential-processes-needed-to-run-windows/)