Does V41 work with Windows Vista or 64-Bit Windows?
Maybe. I have reports that there are some minor problems due to operating system differences. Unfortunately, I don’t have Vista or the latest tools and do not expect to work on this anytime soon. Some have had success by installing to C:\V41 instead of the default Program Files location. One user suggests: manually copying the three original .lod files (HP-41C.lod, HP-41CV.lod, and HP-41CX.lod) to C:\Users\