PDF compatibility

Hi:

I created an exe on a cd with flash, and using a a getURL script, it opens a pdf document in a browser window. Works fine on most machines, once you get past the basic default security settings in IE.

But on some machines, it takes up to five minutes to load. Anyone know why this might be? All that I tested had acrobat and recent versions of windows. Any Ideas why this is happening, and how I might fix it?

Thanks in advance.

Evan