I am having the same problem. I did find this, but it didnt work right for me. Maybe you will have more luck.
How to hard reset rca tablet model RCT6378W2? - Need to hard reset rca tablet ive tried everything! :: Ask Me Fast
You can perform a hard reset on your tablet 2 ways. The first is by going into Settings>backup and reset and choosing the Factory Data Reset option.
If you are stuck at the startup screen or a password/pattern screen and cannot boot into the system, you will need to use method 2, which is booting into recovery mode. Have the tablet powered off first and make sure you have more than 50% charge on the battery. Boot into recovery mode by pressing and holding the volume up and power buttons. At the RCA logo screen, let go of the volume up button and you should next see an android image. Press and hold the power button and tap the volume up button once more and you will be brought to the recovery mode menu. From here, you will need to use your volume up and down buttons to scroll and navigate to the wipe data/factory reset option and use the power button to confirm. When the process is done, go ahead and reboot and your tablet will be set to factory original settings.
http://rcatablets.com/sites/default/files/Tablet recovery mode to wipe data Android 4.1.pdf
Let me know if it works for any of you. For me, I followed the directions but nothing happened, it was just stuck at the android menu. I turned it off. Now when I hold the 2 buttons it just flashes white quickly and the menu wont come up anymore.