Interesting. Perhaps the issue is with existing BB's and Desktop manager. The other user reported that he got his to work on Cingular without any issues but his was a fresh install without a previous BB. I went into desktop manager and noticed that it shows drivers for the 7100. I am going to perform an uninstall just as you did. Can I assume that you did the typical uninstall from the control panel, add/remove programs? Did you keep your 8700 plugged into the USB port while you removed and reinstalled desktop manager? Thanks!