I've experienced this as well. An added thing that I do: First,
download and install the Windows USB driver using the "SDK and AVD
Manager" that came as part of your SDK Tools. (Start AVD by running
the "android.bat" file in your tools directory.) I assume the AVD is
how you got "adb" for Windows. You have probably already installed the
USB Driver package, but I wanted to make sure for the next step. You
might also want to update the Windows USB driver, if you haven't since
January. (If you don't have the AVD for some reason, go here and
install the SDK Tools: http://developer.android.com/sdk/tools-notes.html
Use USBDeview to remove all Android device entries as described by
fba, above. This forces Windows to prompt you for a driver when you
plug in the device. Next, plug in the Android via USB. When Windows
prompts you to tell it where to get a device driver for the new USB
device, do not let it pick anything for you. Select the option to "Not
let it search", and select to choose the driver manually. Navigate to
the directory where the Android USB driver was installed ("C:\Program
Files\android-sdk-windows\usb_driver", by default). This makes sure
you are using the USB driver that Google developed for the Android,
and not something else that Windows has supplied by default.
If your connection problems persist, try rebooting your phone. I have
had the adbd service stop running on my phone, which also prevents new
adb connections.
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