My android has just froze. Wont even shut down. What can I do?

Can the battery be removed

Can you pull battery? Some have power+volume up +volume down reset

try this How to Completely Reset Your RCA RCT6103W46 Android 4 2 2 Tablet

Maybe you can find help in this user's manual
http://www.doublepowertech.com/download/m975manual.pdf

Press and hold the power button for @ 10 seconds. That should shut down your device. Then, after it shuts down, again press and hold the power button until it reboots.

Hi,
Press down the volume up button and then the power button for a few seconds. the tablet will restart.

Either wait for it to die completely and turn it back on or hard boot it (holding down the power button till it shuts off).

hold the re-set button down until the tablet shuts itself down if you have already done this and it does not work and you have had your tablet for less than a year usually the company will fix it for free or send you a new one free of charge because it is a problem with tablet not something you did.

Android is corrupted. You need to factory reset it. Hold volume down and home buttons while turning it on. You can let go of those buttons once the screen changes to the Android loading icon.

This will erase everything from your phone - so good idea to keep things backed up for incase it happens again.

Near as I can figure, this happens when:
- phone battery is allowed to die
- pull battery from phone when it is still shutting down (hard to tell when it's finish)

Get a toothpick and hit the reset button on the back or side