Hi,
Welcome to Microsoft community and thank you for posting your query.
Sorry for the inconvenience caused to you. Let me help you to fix the issue.
To assist you better, please provide us more information.
- Which anti-virus program are you using?
- What is the make and model of the computer?
The issue you are facing could be due to the system is infected. Let’s try simple troubleshooting steps and check if this helps in resolving the issue. Follow the below methods.
Method 1.
If a computer is infected by a virus, lots of resources will be taken up to greatly slow down computer performance. I suggest you to run virus scan (Microsoft Safety Scanner) and check if it helps to resolve the issue.
http://www.microsoft.com/security/scanner/en-us/default.aspx
Note: Any data files that are infected may only be cleaned by deleting the file entirely, which means there is a potential for data loss.
If the issue still persist, try the below method.
Method 2.
I suggest you to boot the system in clean boot state and check if the issue still persist. Clean boot process will help you determine which third party program/app that is causing this issue. It could be some other application or programs, which runs on the computer at the background, leading to this issue. Please visit the below link on how to perform Clean boot.
https://support.microsoft.com/en-us/kb/929135
Disclaimer: 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.
Hope this helps. Keep posting us with the status we will be glad to help to you.