Hi,
For high cpu usage issue, I usually use Process Explorer to troubleshoot, here is a link for you to download:
Process Explorer v15.40
http://technet.microsoft.com/en-in/sysinternals/bb896653.aspx
It's a simple and small tool, once you installed and open it, locate to explorer.exe, you will find all processes related with explorer running in your system, find the culprit of the high cpu usage.
Process Explorer Mini-guide and Screenshots
http://www.bleepingcomputer.com/forums/t/354690/process-explorer-mini-guide-and-screenshots/
NOTE
This
response contains a reference to a third party World Wide Web site. Microsoft is providing this information as a convenience to you.
Microsoft
does not control these sites and has not tested any software or information found on these sites.
Regards
Yolanda
TechNet Community Support
