funny thing... Tried a cheap microUSB cable and it didn't work. It also doesn't even charge my Evo. Crap meritline cable. Tried a halfway decent mini USB cable with the Motorola microUSB adapter. Also nothing.nSo I'm like, "fine, I'll open the OEM Samsung cable" which I hate opening their accessories for reselling purposes. Well that too failed. I leave home and go back to the shore. Have a heavy duty 3rd party cable (nice 5ft one) I've been using down here (on a working vaca and left a bunch of stuff at the shore as I go back and forth). I try that with my winXP laptop and it works just fine. Now I need to try it on my W7x64 laptop at home which I won't be able to do till labor day. Will like to see if it's the cable or the machine. But winXP installed the drivers just fine.
So for people that are having issues, try a quality 3rd party cable (ie. not from meritline, dealextreme, focalprice and such) and see how that works. Then if it does and the OEM one doesn't, complain to sprint. I'll report back when I get home to see if it really is the cable or the machine.