Hosting problem

[solcarlus]

Hi guys, i write you from France and me and my friends from Mille-Sabords.com can't find a solution for my issue.
Here is my problem:
I run DW on win7 64x and i can't host any session:
after the screen where there is "TCP/IP provider....ect" i have a message that says: "enable to host session because of error"

I don't understand because i have no problem to host when i boot my computer with Win XP............


I precise that i already tryed without antivirus or firewall stuff....



So is there someone who had this kind of problem? or the solution ???

Greetings from France....Solcarlus