**** This is an urgent requirement ****

I need a small program which

1. should run as a Windows Service.
2. should always be loaded on the pc, even if the users were to end its process, it should restart itself -- only the administrator user should be able to stop the process / service.
3. should block a certain UDP port, both incoming and outgoing, from all ip addresses and even broadcast (like x.x.x.255, x.x.255.255, x.255.255.255, 255.255.255.255)
4. Please use "trend" in your bid or pm, so I know that you have read this - else I will ignore your bid.
5. should be a single exe -- should run directly without any "installation".
6. should work on Windows XP/Vista as well as Windows 2000/2003 (without .NET)

The program can be built using Visual C++ or Visual Basic (VB is preferred).

I need the full source code, and all rights over it.

Payment by escrow only.

Budget is low, so please keep your bids to the minimum.

If you have any questions, please ask in pm.

cheers,
Satsco.