[Galaxy S III Q&A, Help & Troubleshooting] Jarmezrocks:
I know this is a 7 day old thread, but I feel for you having been in the same situation. Firstly, have you installed the Android SDK? If not then I advise you to do so. Do a search on how to install the SDK. There maybe smaller downloads available with a package of the binaries you need to do some testing i.e. adb. The instructions will elaborate about how to set up your Environment settings in Windows. Essentially ADB needs to be called from within any part of your Windows system....or else you will have to cd to its location each and every time you want to do something like this. So once you have done that, open command prompt and type adb and see what comes up? If it says bad command or file name it means your environment settings for the ASK are incorrect, if it displays the adb help text in command prompt you are ready to proceed.

When you plug your device in (not in DL or recovery modes) is it detected by the PC? If so then your drivers are probably fine. If not then it maybe 1 of 2 things? 1 the device is detected but the MTP drivers have not been loaded or 2. No detection what so ever and all drivers need to be installed.

To determine how to proceed you will need to do a bit of investigating.

Note the USB drivers are included as part of the Android SDK.

Check in Device manager inside of Windows to see if anything is detected when you plug it in. If so but it has a yellow exclamation ! then it would indicate you need to update your drivers (but not always?). From here you can test to see if the phone is detected and you only need MTP drivers.

If not then I would suggest uninstalling Keis all together and downloading and installing the Samsung USB drivers separately. Install the drivers. Plug in the phone. If it is not detected straight away, then reboot the PC then plug the phone into a different USB port. From here you can determine how to proceed by using adb.

plug your phone in via USB and open command prompt and type this: adb devices

You should see 1 of 2 things.

1) The words "list of devices attached" followed by a 16 digit long ID number a gap and the word "device"

2) just the words "list of devices attached" and then blank and nothing else?

If a device ID is returned then you can proceed with the following. Otherwise you need to do some additional trouble shooting

Proceed here:

Once it is detected by Windows and shows up in Explorer then unplug the phone and go into settings and developer options and check enable USB debugging. Once you have done this it should allow your device to be seen in DL and recovery modes.

Troubleshoot: If not detected try the following:

1) Reboot the PC and plug into a new USB port that you have not previously plugged into.

2) Try disabling USB debugging plugging the device in and then unplugging it and reenabling USB debugging

3) From the status bar try switching modes between MTP and PTP modes. Wait a good minute or so between to allow Windows to detect the driver change. Tip a good indication is your notification tray Icon with green USB disk with a magnifying glass swirling around....Note if you cannot see this at all you probably should drag it into the notification panel so that you CAN!

4) Open up device manager again and ensure no yellow exclamation marks !

Once all this is right and you can get List of devices attached followed by an ID number then you can for sure be able to detect your device from Odin. Make sure you are running Odin 3.04, run it as admin (not necessary but have heard that it helps?)

Good luck

James