I too had this problem; Winxp, SP3, ATT Galaxy S3; Kies had worked the first time I tried it, then after some updates quit working; Tried all the usual things people have suggested like uninstalling, reinstalling, rebooting, turning phone off and back on, changing cables, changing ports, nothing worked. Finally booted pc in safe mode to see if I could find the driver that was causing issues, couldn't find any driver at all for the phone under system, device manager. rebooted pc again into normal mode and tried again just for kicks, it then recognized my phone as new software and installed all the drivers and everything works again. So only thing different I did was boot into safe mode, and then reboot into regular mode.
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