TaskManager reports Win7 CPU usage = 15% after startup.....but process usage does not add up

Something (or a combination of things) is causing my PC to use 14-16% CPU usage upon start-up, without starting any browsers or other programs. This is reported by Windows Task Manager. I don't remember ever seeing it this high before, and as I remember it typically use to run around 2% after start-up.
I understand that any process that is running under 1% will be reported as 0% and its possible that there may be more than 20-30 or so process that may add up to 15%. Under Resource Manager, (which reports average CPU for "Services" under 1%) I see several services that together total about 0.1%.
I would expect if I'm running at 15% right from the start I would see at least several process running at 1% or more, yet I do not, EVERYTHING is reporting at 0%, except for processes "System" = 01 and "System Idle Process" = 97. I use to run "GNS3" a Cisco routing emulation program that has you calculate "idlePC" values to keep CPU usage down for each Cisco IOS that is running. I remember having up to 10 routers running with the CPU = 16%.

My question: Is there another windows utility that can report CPU usage more accurately?  Also what is the best way to find the culprits?  I believe I have most all unnecessary things disabled under msconfig/startup.

Thanks,

PS.
My PC is fairly powerful and has a Windows Experience Index of :
Processor = 7.6
Memory (RAM) = 7.7
Graphics = 6.8
Gaming graphics = 6.8
Primary Hard Disk = 7.6
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Joe Winograd, Fellow&MVEConnect With a Mentor DeveloperCommented:
Oh, and for another Windows utility, try Process Explorer:

https://technet.microsoft.com/en-us/sysinternals/bb896653.aspx

Regards, Joe
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Joe Winograd, Fellow&MVEDeveloperCommented:
In Task Manager, tick the box in the lower left that says Show processes from all users:

Show processes from all users
If you don't have that ticked, that may be the reason that it's not adding up. Regards, Joe
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LinkAuthor Commented:
Hi Joe,

Of course I did try tick the "show processes from all users", but it doesn't reveal anything. I just can't understand why my PC continuously runs at 16% at start-up....and why TaskManager  has everything listed at 0% CPU. I'll try Process Explorer and report back later.

Thanks,

Tim
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Joe Winograd, Fellow&MVEDeveloperCommented:
Tim,
I think you're probably right that lots of processes that show as CPU=00 in Task Manager are being rounded down to 00 and that the sum of all of them is why you're seeing the 14-16% CPU usage total. Process Explorer will tell you if you that's a good theory, as it shows the CPU percentage to two decimal places. Here's what its CPU usage column looks like:

Process Explorer cpu to two decimal places
Regards, Joe
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LinkAuthor Commented:
Joe,

I just now am using the "Process Explorer" app, and it seems to report CPU usage much more accurately. Thanks so much for the information!

Best Regards,

Tim
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Joe Winograd, Fellow&MVEDeveloperCommented:
Tim,
You're very welcome! Happy to help. Have a great day. Regards, Joe
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