I downloaded the Kies of the net, installed it and then everytime I plug in the cable to the computer, it will just go straight to the MTP screen. That said, I never had to do any debugging for the USB connecting to Kies. I use XP in the office and the internet connection there is faster, and that could be the reason I have less issues with Kies using XP. I also noticed that if your internet connection is not stable or fast enough, the firmware updates can stop midway.

I am using Windows 7 64bit as well, but when using it with kies, it ran into some issues. So far though, I noticed that Kies is more stable on Windows XP Pro. Transferring files (to back them up), is so much faster by going into USB mode and connecting like that so that the phone works like a external HD. If not for the fact that I need it for firmware upgrades (Officially), and backup of contacts, memo, notes etc., I probably won't be using it at all.

Never realized so many having problems with Kies.