We have a windows app written in c# which is working pretty well on most
machines.

Specifically on three machines the app blows up completely randomly giving
them the "Report Error To Microsoft" dialog.

They don't get a standard Exception window.

If we look at some of the details it's related to code security, which makes
no sense to us as they are all set up the same a.s 100 other users.

We've given one person a different machine, even tried removing them from
the domain and recreating them.

Still gets the same thing.

Ideas?