|That's no help at all!|
You probably have something running in the background. It could be unimportant, it could be an infection, it could be unwitting participation in a supercomputing project (some universities and others and ask some to participate and share computing/processing power over the internet, but some hide their requests and trick participants). Svchost is a cover name in task manager and is usually used by groups of system items to show in task manager, but can be used by others.
1- Update and run antivirus program.
2- Install Malwarebytes (free version) and run it.
3- Install ProcessExplorer from Microsoft, it will show you exactly what processes are running, much better than Task Manager so you can identify and decide what can/should be disabled or uninstalled.
4- Google what you are not sure about.
5- Type msconfig in run box, go to start tab and uncheck everything except windows/microsoft and antivirus program.
7- Go to Control Panel>Add/Remove Programs and uninstall anything you you are sure you do not need (Google if needed) but leave all updates and '.net' items.
9- Do disk clean up (good maintenance practice) and if it has been a while, do disk defragmentation.
Let us know if you need any additional help.
You have to be a little bit crazy to keep you from going insane.