Errors number is IISFUNC:

-101: Problem with OpenSCManager.
-102: Problem with OpenService.
-103: Problem with Stop Service.
-104: Problem with Start Service.
-105: Problem with Get Service State.

-501: Can't open Web Service!
-502: Can't add new key!
-503: Can't configure key to WebServer!
-504: Can't configure Server Comment!
-505: Can't configure Server Bindings!
-506: Can't configure web server to path!
-507: Can't set rights on web server!
-508: Can't start web server!
-509: Can't set dir security on web server!