Task Scheduler Error Message: 80041318
Using the error lookup tool that comes with VC++ (errlook.exe, or "Error Lookup" on the Tools menu in the IDE), the error message for 0x80041318 is "The task XML contains a value which is incorrectly formatted or out of range."
In the case of Task Scheduler 1.0, the error codes used are in WinError.h (search for SCHED_E_). I'm not sure if all the error used by TS 2.0 are there or not, though.