Caution It is not recommended that you change this value, because this will affect all COM server applications that do not set their own process-wide security, and might prevent them from working properly. If you are changing this value to affect the security settings for a particular COM application, then you should instead change the process-wide security settings for that particular COM application. For more information on setting process-wide security, see Setting Process-wide Security.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\OleLegacyImpersonationLevel = value
This is a REG_WORD value that is equivalent to the RPC_C_IMP_LEVEL constants.
If this registry value is not present, the default impersonation level established by the system is 2 (RPC_C_IMP_LEVEL_IDENTIFY).