Sync with windows mobile PDA

I use an ipaq 114 windows mobile based PDA on a Dell Vostro 1710, recently moved from Vista Pro to 7 pro
First synchro after updated to 7 was OK
Now, it is impossible, the status is as follow
- When I plug the ipaq, it is displayed in the "computer" tree structure
- When I check on the PDA, it is "connected"
- When I open the synchronisation center of Windows, there is an ipaq 114 in the list, but it is "disconnected"

I've tried to uncheck the "neable advanced network fonctionality" on the PDa... no change

I use windows firewall, and AVG free antivirus (as far as I remember, during 1st synchro which was OK, I was still using antivir instead of AVG, but I don't think it comes from that

Does anybody have an idea or a suggestion?

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