High CPU usage from spoolsv.exe and Systems Idle Process?

Lately, I've been getting alerts about high cpu usage. Checking Process Explorer, I see that spoolsv.exe is using about 49-50% and Systems Idle is using 45-50. I have no idea why this is happening. Only recent change has been the swapping out of a HP Photosmart printer for a Lexmark Pro 915 printer.

System Idle Process is not using anything, shows % of idle time, higher number = less processor use. At least 1 less thing to worry about.

Thanks 4wd. Actually, after I posted the question, I did a little more research and found out the high system idle was good. I also stopped and restarted spoolsv.exe, and this seemed to fix things. But I'm not sure why this was running at such a high cpu when there was nothing new to be printed???