Hi there! My name is***** am a computer professional with over 15 years of experience with both Mac and Windows computers, phones, tablets, and printers. I'm sorry that you are have this problem. It would be my pleasure to assist you with this. The issue may very well be with your Google account rather than with the tablet. Do you have a computer that you can log into? If so, please go to http://google.com and click on sign-in. Use the same information that you are trying to use on your tablet. Please let me know the results.