I've read the manual 3 times and I still can't figure out how get this tablet to work. I can't get my computer to acknowledge it. I plug it in in and get error messages. All I want to do is to download some pdfs, videos and maybe some music. I don't know if I'll ever try going online with although I do like playing Angry Birds. Can someone please tell me what I'm doing wrong? thank you for your kindness.