Make sure you are on using a USB port directly connected to the computer, and try and try again. How long are you waiting after you get the unrecognized error. This is a common error, and if I remember correct, you just have to wait a bit, and it should reconnect.

Just keep trying it, following the steps exactly as they have it, and you might try it on a third machine, maybe a different branded machine (like if you are using Dell, try something different).

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-Michael
Need help setting up your i730/i830 or other WM2003/WM5 Phone, as well as the other hacks I have done, check out the MRailing Guides and Links