Tablet wont turn on

I have an Acer Iconia A500 tablet I purchased in December of 2011. I have a free malware app, which does just the basics. It has slowly been getting slower and slower. Yesterday I put my screen to sleep, my hitting the power button quickly, but when I went to turn it back on, it wouldn't accept my password. Then the screen wouldn't even turn. After many attempts, I managed to turn it off completely. Now It wont turn on al all. I need help. Im afraid to reset it for I don't know if that will cause me to lose all my information and everything on my tablet. I do believe that I had the automatic back-up turned on in my settings, but I don't know where it goes or how to retrieve it... Please Help, Krista