Standalone blocked by "software restriction policy"

[AcidJazz]

We're running a large study with Canadian physicians.  They must download a
standalone file to their computer.   The other day one of the lab assistants
was checking the program and got the following message on her windows
machine:

"Windows cannot open this program because it has been prevented by a
software restriction policy.... contact your administrator"


I've been using mostly macs these days, and can't tell you anything more
about the circumstances surrounding this particular block, but can someone
familiar with Windows tell me how *common* I should expect this problem to
be?   A quick google search suggests that this error message has been around
since Windows XP.   Assuming most people using Windows 7 these days, how
worried should I be about our standalone getting blocked?   There's no way
in hell that physicians are going to take the time to change their settings. 
Heck, most aren't going to take the time to download the standalone in the
first place.

Nuts, now I'm getting depressed.

Mark


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