Try At this point, you likely need to do a full reset of the tablet to get it going again. Alas, this does mean that you would lose anything you have on it. First try starting it up in "Safe Mode" and see if it will load. If it does, then this will give you the opportunity to save your personal stuff (photos, contacts, files, etc., but not apps, can't save those) and then do the reset.
To get into "Safe Mode" please do the following.
1. First turn off the tablet.
2. Next press and hold "Power" until you see the manufacturers logo on the screen, then release the power button.
3. "Quickly" press "Volume Down" and hold it for few seconds until you see the message "Safe mode: ON" or something similar.
4. If you wanted disable it...