I am not sure whether you checked my reply in that thread or not.. but here it is
SP3 is not a problem. it worked on my system..
Check with another USB cable if you have. Also how old is your system... it can be a USB port problem..
Also check for some anti-virus and firewalls.
I would suggest the best option to check to plug it in a different system.. if it works there then there is a problem with your PC.. if does not then .. you know what