This is all I got, I dont know why it still isnt workin

Can you post your main as well.. ? Place where you create all your controls (like goCreateAccount, goLogin, accountPicture1...)

A few things I can see:
1. checkInfo() doesn't return anything. Also the handler for loginBtn doesn't do anything else than call checkInfo() so in effect when you press the button nothing happens on the GUI.
2. In checkInfo() you are not using the file to which you had written in saveAccountInfo(). Of course you're also not using Properties class but I assume you've thought abt it and decided to serialize the object itself, which is also okay..
3. Lastly I'm unable to make out the overall flow in the GUI part, when you click login btn what happens? when you click the create a/c btn what happens... ?....