There's a fair chance that an svchost that isn't a legitimate windows process is a rat. Download an antivirus program and run some scans. If you're worried about your webcam being accessed, disable it.
If you have a good anti-virus program (AVG/Kaspersky etc) then run it and it should pick it up if it's a virus. If not, you've got nothing to worry about.
An anti-virus won't pick up a rat, especially a good one.
So just make it really IS gone before you go changing things/logging onto personal things you want to keep safe.
You can always restore your computer to previous data or completely wipe out your pc plus if you have something important on your computer, put it in an usb and start the restore.