You do realize that for windows 7 is no longer activesync, it is now windows mobile device center and it can be downloaded at the link provided. Also make sure you have done the following on your phone
START,SETTINGS,CONNECTIONS,USB TO PC,MAKE SURE ACTIVE SYNC IS TURNED ON , ALSO WHERE IT SAYS AT THE BOTTOM ASK ME FIRST ABOUT USB CONNECTION TYPE ETC.
YOU CAN PLAY WITH TURNING ON/OFF ENABLE FASTER DATA CONNECTION ON MY END I HAVE IT ON BUT ON PREVIOUS WINDOWS VERSION I HAD TO TURN IT OFF IN ORDER TO GET IT TO WORK CORRECTLY
http://www.microsoft.com/windowsmobi...-download.mspx