AddMonitor() error 1805

[SKShah]

I am trying to develop a printer driver.
AddPrinterDriverEx() is working perfectly with environment "Windows IA64".

But, AddMonitor() gives error 1805 i.e "The environment specified is invalid."

I am using Windows XP (SP3) and for development Visual Studio 2005->VC++.
So, any one can suggest me which environment i should use ?

I can give my code of this function also for more details.

Waiting for reply.

Thanks & Regards.