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Mines' working fine. I have windows 7 pro. Did you buy a premade pc like a Dell, Acer, HP, ect, ect? I built mine and have no issue plugging my Epic to my pc.
Have you tried using the other usb ports? Have you tried another cable?

I've got an old Dell that's running XP Pro and am also experiencing problems as far as Windows not recognizing the Epic via the USB connection. I purchased a generic cable that came with a cd rom w/ drivers, and after loading the drivers, Windows still won't recognize the device. I also d/l'ed the USB drivers from Samsung's site and that didn't work either.
OK, I had to call customer service to get this one resolved. I have an old Dell running Windows XP Home Edition Service Pack 3.
Make sure you have wifi and bluetooth disabled on your phone.
I did download the drivers from Samsung's website first.
Plug your phone into a usb port on your desktop computer. The phone will give you three choices. Choose the third one that says "tether mode."
I hope it works for you. It works for me.
Mine wasn't working either, I read a post on this site (I believe, could have been SDX) and several people had the same problem, however the phone would work fine if they used one of the back USB ports, instead of the front. Sounded like BS to me, but I tried it and it worked (and still works). My computer is a Hp desktop, XP Pro SP3. Give it a try, cost nothing. I did install the drivers off the Samsung site too, not sure if that makes a difference.
Thanks ! I tried using one of the USB ports in back of the PC and the Epic did indeed show up. However, I received an error message in Windows that said something to the effect of:
"A problem occurred during hardware installation. Your new device might not work properly."
I checked under "Device Manager" saw the Epic listed, however double clicking on it produced another error message:
"Cannot start device. Code 10."
Would anyone have the direct link for the XP USB drivers on the Samsung site? I d/l'ed them earlier in the week, installed them, and then deleted the zip file.
I am having the same exact problem your having and ive been trying for 2 weeks now to use mass storage on my pc with vista ultimate same exact issues
Try enabling then disabling USB debugging mode. It worked for me (no idea why, but it did):
1. Go to Settings --> Applications --> Development
2. Check 'USB debugging' (will prompt you to unplug USB cable if plugged in
3. Plug in USB cable
4. Uncheck 'USB debugging'
5. Plug in USB cable again, select Mass Storage
Mine wasn't working either, I read a post on this site (I believe, could have been SDX) and several people had the same problem, however the phone would work fine if they used one of the back USB ports, instead of the front. Sounded like BS to me, but I tried it and it worked (and still works). My computer is a Hp desktop, XP Pro SP3. Give it a try, cost nothing. I did install the drivers off the Samsung site too, not sure if that makes a difference.