In Windows, you should hear the beep on a connected device and the LG drivers should find it OK. In Windows, open up Device Manager and you should see 2 devices with yellow exclamation marks beside it and the description "LG USB Modem" (I'm going from memory here, so that may not be 100% accurate).
Right click on the 2nd one, click "Update driver software", click "Browse my computer for driver software" then click "Let me pick from a list..." You should see "Android Phone" listed. Double click this and you should see a list of 3 options. Click on "Android ADB Interface" and click "Next". You'll probably see an "Update driver warning" box, so just click "Yes" to install it anyway.
I see the 2 devices with the exclamation marks saying "LG USB Modem" but I don't see "Android Phone" listed.
I been trying to root this phone for weeks now; going back to steps to see what I have been doing wrong. I'm starting to get frustrated uninstalling and reinstalling the drivers and SDK.
HELP!