Erk! errors!

I have just got the demo of the new particleIllusion program (i have been using the previos version before, but somewhat need the motion blur effect that didn't work....), and i am trying to export a rather large .png (1200*1200), however, whenever i do so i get an error saying "Cannot locate PillusionRender.exe", and it fails - but if i make the image smaller, and thus unusable for it's end purpose, it renders without issue. If i try using the pIllusionRender.exe program by itself, i get one of those "This program has encountered a problem and needs to close" dialogs, and the compiler goes nowhere. The log file it produces is empty except the header.
Any ideas?