My 3yr old hp pavillion is currently giving me many problems. Now when I try logging on it goes black for a second then will take me back to the log in screen. I usually have to bring it back to a restore point then when I restart it goes back to not letting me on again. I went into safe mode and it logged me on and when I did I did a virus scan with AVG and Malwarebytes antimalware. What else should I try?