Hello Travis,
Thank you for visiting Microsoft Community and providing us with the detailed description about the issue.
As per the description, I understand that you are experiencing issue with CPU usage to 100% while watching videos online on the system.
I certainly understand your concern and will try my best to help you.
I would suggest you to try the following methods and check if that helps.
Method 1:
To diagnose the problem whether any third party program or application is causing the conflict, I would suggest you to try “clean boot” and check if it helps.
Placing your system in “Clean Boot” state helps in identifying if any third party applications or startup items are causing the issue. You need to follow the steps from the article mentioned below to perform a Clean Boot.
How to perform a “clean boot” in Windows, please follow the steps in the link provided below.
http://support.microsoft.com/kb/929135/en-us
Important: Putting your system in Clean Boot state helps in identifying if any third party applications or startup items are causing the issue. You need to follow
the steps from the article mentioned below to perform a Clean Boot.
Note: Refer "How to reset the computer to start normally after clean boot troubleshooting" to reset the computer to start as normal after troubleshooting.
Try to reboot the system and check if it helps.
If the issue persists, follow method 2
Method 2:
Try to run system maintenance troubleshooter and check if it helps. Please follow the steps in the link given below.
Note: System maintenance troubleshooter looks for unused files and shortcuts that you clean up or remove so that your computer can run faster.
Open the System Maintenance troubleshooter.
http://windows.microsoft.com/en-US/windows7/Open-the-System-Maintenance-troubleshooter
I hope this information is helpful.
Please do let us know if you need any further assistance, we will be glad to assist you.
Thank you.
Jayant