If all you're trying to do is transfer files from/to your Captivate, and you're having trouble with the USB drivers, just download an app called SwiFTP. I got it and it took me half a minute to gain access to my files and MP3s on the phone, wirelessly, over WiFi, using Windows file explorer. Then just drag, drop, delete, copy, whatever. No jailbreaking, rooting, sideloading or hacking required. P.S. I think this should be a sticky since so many people are having trouble with USB.