I am facing a similar problem! i have XP prof SP1 and when i start the PCSync, it says that PCsync has created some errors and needs to be closed! And then the software exits! With RConnect, as soon as it validates my username and passwd, my system restarts! Its working fine on my friend's system who has win 2k. Is reinstalling windows the only solution? I definitly think there is some problem with the USB drivers in my OS. Does anyone has any other solution?