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Duplicate syn packets sent from Windows server 2003 sp2

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http://serverfault.com – My pc is running Windows server 2003 sp2. Whenever I establish an internet connection (e.g., with internet explorer to google.com), my host sends the syn packet twice. It is (probably not) a retransmit as the two syn packet are sent within a 0.01 ms interval (according to wireshark timestamping). I wrote a short java program that simply do a socket.connect and I have the same thing, but if I run the program on another machine (with Windows XP), it is fine (no duplicate syn). Anyone has a clue what this is about ? A bit more data: When I initiate a tcp connection with google.com, my pc sends (HowTos)