Acer Iconia A500 not in adb devices

Question

Just picked up an Iconia A500 (yay $100 off coupon) and started messing with it playing games, etc.

I decided it was finally time to work, fired up adb and launched eclipse to test an app and I discovered it wasn't in my devices list. I've tried installing the acer drivers. It puts a folder in my Program Files directory...but I don't see what I'm supposed to do there. There's "EUUDriverInstaller" but when I click on it nothing (seems to) happens.

When I plug the device in it uses some generic Microsoft driver to show the device contents but composite adb doesn't show up at all like it does for my Droid.

I've reboot several times on both device and laptop. I've uninstalled / reinstalled the application that made that driver directory. I opened an application in the driver directory under the x64 folder and it opened up the windows driver installer and installed some drivers...but still no composite adb when I plug it in. It is on usb debugging and I've toggled it on and off.

It's running 3.1 stock I'm on x64 Windows 7

Both command prompt adb devices is empty under "List of devices attached" and Eclipse devices is empty. My sdk is fully updated.

Answer 1

Yet another set of symptoms, and another answer....

A500 using 3.2 roms (I have other 4.x devices, so I'm saving this one). Using Windows 8. Downloaded and installed the Acer 1.06 drivers. Have previously isntalled Google ADB drivers for the Nexus 7 from android-sdk\extras\google\usb_driver\amd64 (or i386 if that's appropriate), but that may not be required.

Plug in the A500, and launch device manager. The Acer Iconia Tab A500 device shows up in "Other Devices" folder but with no drivers installed. Click on the device, click on "Update Driver". Select "Browse my Computer". Click "Let me pick from a list of device drivers on my computer". From that list, select "Android Device". Select "Google" as manufacturer, and select "Android ADB Interface" as the Model. CLick "next". Click "Yes really, really do it please". Done.

Edit:

On windows 8.1, the behavior is different again. The device will show up in the "Android Device" folder. Right click on that, and proceed as described above to select and isntall the "Android ADB Interface" driver. I'm having to do this with all my devices. Windows 8.1 seems to istall everything BUT the ADB driver, which you need to forcibly install using this procedure.