"rthdvcpl.exe is a Control Panel applet from Realtek belonging to the High Definition Audio System driver. The process HD Audio Control Panel or RtHDVCpl.exe belongs to the software HD Audio Control Panel or RtHDVCpl.exe or Realtek High Definition Audio by Realtek Semiconductor." www.processlibrary.com
If you are concerned about this file uninstall your audio driver and see if it goes away. If it is gone reinstall realtek driver and you should be good.