Why would this turn up in task manager/NIS firewall entry

Just a question I was on the pc and heard the add/remove hardware noise....I had not plugged anything in or removed anything. I opened up the task manager to see what was going on in there and I saw Spoolsv.exe.I know this is to do with the printer and printing.I have no printer connected and when I did have it was through the networked computer across the room,which is not connected now.

Anyway I looked in NIS2010 and in the Firewall a new rule was created for Spooler Sub system App.What is this as I have not seen it before? it happened about the same time as I have heard the noise.Easily explained or a cause for further investigation?