Try a factory reset.
http://www.androidtablets.net/forum/android-tablet-q/62022-how-do-i-factory-reset-my-tablet.html
If there are no instructions there specifically for your tablet, try some of the methods for other tablets. One of them will probably work and you won't hurt anything by trying.
The first boot will take a while, after that it should go back to normal. Wipe everything you can in the options available.
Not familiar with your tablet, but with the brand I am, I have several iview tablets.
The company usually has factory software on their site for almost all of their devices.
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