Rthdcpl.exe is part of Realtek HD Audio Control Panel. It's installed along with the drivers for Realtek sound cards and audio devices and lets you modify the settings of your Realtek audio device.
Rthdcpl is an nonessential system process but you shouldn't disable it unless it is really necessary. If at last you've decided to disable or even uninstall Rthdcpl.exe, then be ready that your system may be left without sound.
rthdcpl.exe - Illegal System DLL Relocation This process uses 100% CPU time
Sometimes the spyware or virus writers simply place a similiar or same named file elsewhere on your computer hoping to fool you. Mostly there is only one instance of this process running at a given time on a system. The presence of multiple rthdcpl.exe processes may be an indicator of a malware infection. If you don't have a Realtek sound card, then you should clean your computer.
Author: Realtek Semiconductor CorpPart Of: Realtek HD Audio Sound Effect ManagerCommon path(s): %WINDOWS%