Hi,
Well, I have Aero turned off too, have it set to "XP-theme". MELABS says that one must use MPASM with 64bit versions of Windows so trying not to wasn't a good idea on my behalf. Still, when using MPASM it gives me more errors.

Darrel, I'll give that UAC thing a try. I've already set MCSP to run as Administrator but perhaps there are other things that need to as well. Turning it off - at least temporarily - will show if that is where the problem is. However, since the error message specifically complains about a 16bit program (run.pif) not being compatible with the 64bit version of Windows I wonder.... Still, MELABS is indicating that it's supposed to work and obviously it IS working for mackrackit. My typical luck I guess...

Will try a command line compile too.

/Henrik.