Sounds like you had rooted it and deleted the launcher through that toolbox, you'll need to reinstall the firmware again and probably best bet for that is xda forumsI've used the Fire Toolbox mentioned, and it's a great tool. Unless you can do that while in recovery mode. There may be other ways using adb commands connected to a PC and all that, but I don't know if you can get to your device setting page to enable all that if there is no available interface with the tablet. Anything else you installed outside of Amazon will have to be manually added back in. It may ask it you want to do that anyway after signing in to the account. If you keep it tied to your Amazon account, you should be able to re-install your apps. Use the volume buttons to select the option for 'wipe device/factory reset'. Keep holding them down through the Amazon logo, and it will boot to the recovery screen. Then press the Power and Left Volume (or the top Volume, depending on how you hold the device) buttons at the same time. Power down the device - hold the power button down until the option to turn the device shows up, then click 'Power off'.
Although, this is a last resort and wipes your tablet.
