Force firefox to use set profile (Firefox Portable)

I have recently rolled out Firefox 3.6 across our network running windows XP which automatically used the profile I have set. This is so changes to the proxy and about:config are locked out.

However users are still able to run Firefox Portable from their USB sticks and work areas. Are there any fixes out there that can either
[step="a"]Stop the running of firefox through portable apps (Have tried many different ways to stop this but to no avail)[/step]
[step="b"]Force the Firefox Portable to use the default profile (Located in "C:\Program Files\Firefox")[/step]

I do have a possible solution to this which requires a hidden app running which kills the portable app process but was after something more efficient.

Any ideas?
alumwellAsked:
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ForrorCommented:
Interesting article for your review, user wanted to block FF portable as well:

http://www.edugeek.net/forums/windows/7041-stopping-exe-files-being-run-usb-stick.html

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alumwellAuthor Commented:
yeah it looks like the only way to stop it currently is to have that hidden process that checks to see what processes are running ever 10-15 seconds. Just hogs the memory a bit too much for my liking.
alumwellAuthor Commented:
Article linked too had useful hints and tips but the main answer on there was the option that I was already doing.
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