Hi,
It appears that you have an issue with High CPU usage at idle. However, in order to guide you in the right direction; I will need some more information. Please help me by answering the question mentioned below.
Did you make any changes to the computer prior to this issue?
In-order to fix the High CPU usage issue, refer the following methods.
Method 1:
Check if you can experience the issue in ‘Safe mode with networking’; if safe mode with networking works fine then set the computer to ‘Clean boot’ state to check for software conflicts.
Step 1:
Windows Start-up Settings (including safe mode).
http://windows.microsoft.com/en-gb/windows-8/windows-startup-settings-including-safe-mode
Step 2:
Keep the computer in clean boot and check the issue status.
How to perform a clean boot to troubleshoot a problem in Windows Vista, Windows 7, or Windows 8.
http://support.microsoft.com/kb/929135
Note: Please go through the section: How to reset the computer to start as usual after troubleshooting with clean boot of the Kb article to boot the computer in normal startup after fixing the issue.
Method 2:
I would also suggest you to run “System Maintenance” to diagnose and fix the issue. It finds and cleans up unused files and shortcuts, and performs maintenance tasks.
Follow these steps:
a. Press “Windows key + W” from keyboard.
b. Type “Troubleshooting” without quotes in the search box and hit enter
c. From “Troubleshooting” windows click “View all” option from the left panel.
d. In the list of options, click on “System maintenance”.
e. Click “Next” and follow the on-screen instructions.
Hope this information is helpful. Please do let us know if you need assistance with Windows, we’ll be glad to assist you!