Computer Help and Support

Choose Task Manage. That should show you what apps are chewing up your processing time. It shows CPU used / Memory used / Disk Processing / Network Processing

You may have a an app that's been activated and is using your PC for some nefarious purpose.

Clicking on any of those headers will sort to the highest user, instead of the App name. You can right click on the app and "end task. Caution, though, it may impact on your Windows functionality if you don't know what you are stopping.

If uncertain, write down the apps that are creating your problem and either Google the app or post that info here for feedback if this is a part of the O/S or some malicious app using your laptop,