Some of the 3th party assemblers used with the MCU module are 16-bit applications.
Microsoft removed the 16-bit subsystem from their 64-bit OS, that is why these assemblers will not run under 64 bit vista.
Work is currently being done to get around the missing 16-bit subsystem problem
Regards,
Rodney
Principal Software Architect for the Electronic Workbench Group
National Instruments