2 possible solutions for you !!!
one:
http://www.microsoft.com/windowsmobi...t.mspx#desktop
concering firewall port allowing ...
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#2 :
go into your "control panel" .... "system" ...and under your "hardware" ..."device manager tab" ....check your USB controllers ... you "MUST" have an instance of "USB 2.0 ENHANCE drivers" ... ENHANCE USB driver is a must in order for WM5 & ActiceSync.
if you don't see an instance of "ENHANCE" anywhere within the USB controllers group ... find out your motherboard name and go to the manufacture homepage and get the "USB 2.0 enhance" driver !
Hope this will fix your problem ... I too had suffered for awhile & after some reading, found it out the HARD way