I am running Vista Business x64 but I get an obscure message when I try
to run the InkBall game (I have used Inkball and only recently noticed that
it no longer worked, I need Inkball (the ink function) to work so that I can
use PC Tablet, I also like the game :

"InkBall is not working on your computer right now. Restart your
computer, and then try again. If the problem persists, contact your
system administrator"

Rebooting doesn't fix it and contacting my system admin (me!) doesn't
either. It looks like a permissions issue but other games with the same
permissions run OK.

I would be most grateful to anyone who can offer some clues as to what
might be causing this and how to fix it.

I have tried uninstalling and reinstalling but no luck.