I've installed, uninstalled, and reinstalled Kies multiple times. I've installed the USB drivers that come with Kies. I've downloaded the drivers and installed them separately(with Kies installed and not-installed). The most recent drivers I found were 1.5.45.
I've tried turning the Debugging off and on.
With WinXP, I often needed to reboot or uninstall Kies to get the program to work. Frustrating, but it worked. Now, it won't.