Error installing a virtual printer driver on windows 7 64bit

I have developed a virtual printer driver in vc++.net and it is working fine in 32 bit environment. But while install it in win7 64 bit, it throws an error "Operation could not be completed (error 0x800f0214)" at the line

rundll32 printui.dll,PrintUIEntry /if /b "printername" /f "printer.inf" /r "printer port" /m "printer model" /hx64

Note: printerdriver.dll is compiled in 64bit.

Could you please help me to sort out this issue?

is your INF file correct?? do verify it using INFGate.exe and there should be no errors reported by the tool.

If the INF file is correct, then it must be a signature issue, please note that signing is required for windows64 bit drivers, but not for 32 bit drivers.

In order to sign your driver, first make a cat file using inf2cat.exe and then use sign tool to sign the catalogue file... all these tools come with winddk...

have a look at this link for details on signing: http://msdn.microsoft.com/en-us/library/windows/hardware/ff544865(v=vs.85).aspx