You most likely have a virus. Don't focus on svchost.exe but download (and choose to update but not run) Malwarebytes' Antimalware, reboot your PC into "Safe Mode With Command Prompt", and navigate the command prompt using DOS commands to
c: \program files\malwarebytes' antimalware
or if you're using a 64bit version of Windows:
c: \program files (x86)\malwarebytes' antimalware
and then run mbam.exe from there, and scan your PC. You will probably find several nasties. Choose to remove them all when prompted to do so. Reboot following this and bob should hopefully be your uncle.