Hi Conrad, I downloaded Vortex last night, and it ran fine for me. I have vista ultimate with all the updates on this laptop. I normally download and run freeware. I noticed that your program was small in size, it could be that it needs some type of run time files, to run. That I all ready have on this computer. That's my best guess.
I would go back to the people who had the problem, and ask what type of operating system they had. also if this is a (net) program, the computer has to have the right version of net on the computer for the program to run.
I'll try to get back to you later to night. I have to find out what is wrong with my car, the speedometer refuses to move.
Come see me at Systematic Investing group #board-966 lets talk formula plans.