How do I get my CMP759 TABLET to stop loading? I tried resetting it several times and it turns off. When I turn it back on it will only stay in the loading stage.

Press power and volume + together until reset screen comes up then select factory reset!

The default passcode (WEP etc...) is usually on the router. Hopefully he didn't change it.

http://syspcqa.com//52260/help-my-i-craig-model-%23-cmp759-froze-up-what-do-i-need-to-do
Try this link to know more.
Gopakumar Gopalan Google

I could not turn my tablet off, so I removed the back and disconnected the battery for 30 seconds. I then plugged battery connection back in and turned on. Tablet came on normally.

i get this when i boot it up unfortunately the process com.google.process.gapps has stopped ok what does this mean

To unlock your tablet, you will have to perform a factory/hard reset of the device.

Performing a hard reset will DELETE ALL DATA from internal device storage and reset the tablet back to the state before you turned on the device for the first time. Resetting the tablet does not erase any system software updates you have downloaded or any files on your SD memory card, such as music or photos.

To perform factory/hard reset please follow those steps:
1. Turn the power off.
2. Press and Hold the Volume Up and Power button at the same time.
3. When the start up screen show (Samsung logo displays on the screen), release all the buttons.
4. Use the Volume Up/Down button to navigate to "wipe data/factory reset", select with Power button
5. Select "wipe data/factory reset"
6. Select "Yes -- delete all user data"
* Allow several minutes for the factory data reset process to complete.
7. Select "reboot system now"
* Allow several minutes for the reboot process to complete.

Turn it off completely. Either by reset or shutdown.
Leave it off.
plug in charger and leave it alone for 4 hours.
Power it back on.

At this point you'll want to return or RMA the unit to Archos for repair/replacement. You can find information on how to do this on their homepage.