> You have probably already done these things but here is my usual approach:
> Reduce to the minimum configuration...


Yes


 Shut down anti virus, firewalls


I don't use them, I have a router on the pipe to the internet.

networking, etc.


If I can't network, then it's a paperweight.

Reinstall the application.
> Disconnect all unnecessary hardware, especially firewire, usb etc.


Yup.

Consider a malfunction in the PDA....


Happens even when the PDA isn't connected, and hasn't been for days.


Make sure you are allowing active x and turn off all the other things you do
> to maintain a secure environment!


Umm...
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