HTC Kyser - Windows Mobile Device center (Vista) and Sync problem

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Hello there, I am tryig to sync my phone with usb cable via windows mobile center 6.1. My OS is Win Vista home premium. My device is recognized by PC as media device and thus it could be set up by windows media player. When the "advance network functionality" on my PDA is checked is off, the on PC -> Network connections there is no local area connection to the mobile device. If I am checking the check box, then the laptop creates the connection to the mobile device, active sync starts to work, but nothing. The sync process is not completed and the status on the PDA is "connected. BTW in this situation I am able to browse the device and its file contents.
Tried to uninstall->install the mobile center few times - the same. Upgraded to the official WM 6.1 - the same. When trying to connect to PC with WinXP and active sync 4.5, everything is fine. This causes me to think that the problem is definitely in Vista.
Please, if anyone have information on this problem or could help, would be great.
Thanks in advance to anyone who might post any feedback!

Regards,
Stephan