HappyPuppy's advice is definitely the fail-safe solution. However, I've had good sucess with issues similar to your's by doing the following. download a free trial copy of system mechanic, then remove your modem, it's software and any tweak utilies, ect. that you tried. once you've removed everything use System Mechanic to find and clean out the now useless reg. entries, files and invalid uninstaller info, ect. When your done using System Mechanic you should be able to shutdown, reinstall the modem and have a clean slate with it, so to speak. There are many other utilities which can accomplish the same task so if you have SystemWorks or something similar, you can do the same thing.