Out of curiosity, can you tap the satellite bars on your unit and, in the next screen tap on the version number. The following screen will show the application installed. Can you post what it says, please?
(something like 9.053.xxxx). I'd like to know all the digits.
Never mind the above.................
Do this:
1. Take an Explorer, not Home, backup of your unit's contents.
After making sure you have the backup on your computer, then...
2. In Home, go to Manage My Device. Items on Device. Application.
3. Select it and choose Remove from Device. Don't copy to computer.
4. Remove the device from Home using the Device Disconnect icon.
5. Shut down Home, even from the notification area on your computer.
6. Start Home, reconnect the device and accept the application. Install.
Go through the process again of trying to get Dave the computer voice.