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Hi Dave,
Thank you for posting your question in the Microsoft Community!
After going through your issue description, it appears that you have an issue with the computer performance. However, in order to guide you in the right direction; I will need some more information. Please help me by answering the questions:
Which antivirus are you using on your computer?
You are facing the issue might because of k9 web protection program performance. Let’s try to fix the by performing the following methods.
Method 1:
Uninstall the k9 web protection program, restart the computer and check the issue status.
Uninstall or change a program.
http://windows.microsoft.com/en-CA/windows7/Uninstall-or-change-a-program
Method 2:
Perform system restore to a system restore point where the computer was performing fine.
System Restore.
http://windows.microsoft.com/en-US/windows7/products/features/system-restore
Hope this information is helpful. If the issue still persists, I would request you to reply us with troubleshooting result to assist you further, we’ll be happy to assist you!!