OK: Ich have the solution: (Windows) YOu have to go into the control panel, and sort by publisher (dont kno the english word for the ones making the softwre, you know what i mean xP). Then you have to uninstall EVERYTHING from Apple, (except Safari, doesn't matter, here it worked without ?ninstalling it). Then, uninstall pdaNet Desktop.
Now: Restart.
Then: Install iTunes 8.2.1.6 or lower (e.g. x86: h**p://bit.ly/42M830), then also install pdaNet 1.53.
Ta-Dah! It works!