If you have tried to connect your portable device and it has failed to install with the error: "A service installation section in the INF is invalid", just download and install this file, (which i did) and then re-connect your device. IF it stills fails, then go to Device Manager, select your device (which should have a yellow mark on it) and click on Update Driver, just follow the prompts and it will finally be recognized and correctly installed. It has worked for me. I have been trying to connect my Samsung Vibrant (Android phone from T-mobile) to my PC (windows xp sp3) to the Kies (Media sync software) and was always getting this error, now , after installing the mentioned file it works!!!
Here is the link again: http://go.microsoft.com/fwlink/?LinkId=71641&/umdf.exe