Program Compatibility Assistant Service (PcaSvc) Defaults in Windows 10

This service provides support for the Program Compatibility Assistant (PCA). PCA monitors programs installed and run by the user and detects known compatibility problems. If this service is stopped, PCA will not function properly.

Default Settings

Startup type:Manual
Display name:Program Compatibility Assistant Service
Service name:PcaSvc
Service type:share
Error control:normal
Object:LocalSystem
Path:%SystemRoot%\system32\svchost.exe -k LocalSystemNetworkRestricted -p
File:%SystemRoot%\System32\pcasvc.dll
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PcaSvc
Privileges:
  • SeDebugPrivilege
  • SeBackupPrivilege
  • SeRestorePrivilege
  • SeTcbPrivilege
  • SeAssignPrimaryTokenPrivilege

Default Behavior

Program Compatibility Assistant Service is a Win32 service. In Windows 10 it is starting only if the user, an application or another service starts it. When the Program Compatibility Assistant Service is started, it is running as LocalSystem in a shared process of svchost.exe along with other services. If Program Compatibility Assistant Service fails to start, the failure details are being recorded into Event Log. Then Windows 10 will start up and notify the user that the PcaSvc service has failed to start due to the error.

Dependencies

Program Compatibility Assistant Service cannot be started under any conditions, if the Remote Procedure Call (RPC) service is disabled.

Restore Default Startup Configuration for Program Compatibility Assistant Service

Before you begin doing this, make sure that all the services on which Program Compatibility Assistant Service depends are configured by default and function properly. See the list of dependencies above.

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config PcaSvc start= demand

3. Close the command window and restart the computer.

The PcaSvc service is using the pcasvc.dll file that is located in the %WinDir%\System32 folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 10 installation media.