svchost.exe is a generic service hosting container. Any number of required system services can be running in them, so I would not get rid of them. You can use Process Explorer Process Explorer to determine what services are running in the host container. My guess is it's Windows Update or BITS running. You can also verify if Windows Update is downloading anything with the following.
Press the Win key type powershell, right click powershell and select Run As Administrator
In powershell type Get-BitsTransfer -AllUsers
If you see any job listed as Transfering then your computer is downloading an update. Queued indicates a download that will start soon