Problem with Samsung Galaxy Ace S5830i. When I got the phone and was using Windows XP, I had frequent problems connecting to my computer. I reinstalled Kies, and the USB drivers probably more than a dozen times. I recently upgraded to Windows 7. The problem has gotten far worse. Now, instead of there being frequent problems that I get taken care of after an hour or two, I usually go to bed without a solution. I turn USB debugging off and on, plug and unplug the phone, try different ports. I reboot the phone and PC. I reinstall the drivers. Usually, these don't solve the problem. SOMETIMES one of them does solve the problem. I've replaced Kies with Freemake for video conversion. It seems to be more reliable.