I haven't been following this thread, but I have some time today to help you out.
First - download and install it - it's winpcap and you need it for the next piece to work (it's very small)
Now download - this is windump.exe (it's smaller) and will allow you to easily capture all network traffic to/from your computer - put it in your windows/system32 folder (these links are virus free - I checked them this morning, but I'll guess you have A/V software as well anyway).
The only piece of info you'll need beforehand is what network adapter to listen to. To get that open an cmd prompt and type "windump -D" that will print a list of your network adapters. Depending on how windows is set up you may have 2 or 3 listed - just paste the list here.
Once that is done I'll make a run script for it, you will set it up and then reboot, open FTP, wait for it to completely fail (walk away from your computer if you have to but don't do anything else), and then email me the resulting file. I will analyze the traffic and hopefully will be able to let you know what the problem is - usually I can diagnose about 75%+ of issues this way.
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