If you think that this file contains a virus or another malware, please download a virus scanner.
If opvapp.exe is using too much CPU or too much memory in your system, it is possible that your file has been infected with a virus. Try to install an antivirus to see if it helps.
If you want to remove opvapp.exe from your computer, just go to Start > Control Panel > Add/Remove programs and select HD Audio Control Panel from the list.
You may try contacting Realtek Semiconductor, the developer of opvapp.exe and ask for more information.