User Data Access (UserDataSvc) Service Defaults in Windows 10

Provides apps access to structured user data, including contact info, calendars, messages, and other content. If you stop or disable this service, apps that use this data might not work correctly.

Default Settings

Startup type:Manual
Display name:User Data Access
Service name:UserDataSvc
Service type:user share process template
Error control:ignore
Path:%SystemRoot%\system32\svchost.exe -k UnistackSvcGroup
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UserDataSvc
  • SeImpersonatePrivilege
  • SeCreateGlobalPrivilege

Default Behavior

In Windows 10 it is starting only if the user, an application or another service starts it. If User Data Access fails to load or initialize, Windows 10 start up proceeds without warnings. However the error details are being logged.


User Data Access cannot be started under any conditions, if the User Data Storage service is disabled.

Restore Default Startup Configuration of User Data Access

Before you begin doing this, make sure that all the services on which User Data Access 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 UserDataSvc start= demand

3. Close the command window and restart the computer.

The UserDataSvc service is using the userdataservice.dll file that is located in the C:\Windows\System32 directory. If the file is removed or corrupted, read this article to restore its original version from Windows 10 installation media.