I bought a new PC running Windows 7 Home Premium 64 bit. When I wake the computer up after it has been sitting unused for awhile, a login screen appears and I have to click on my name (the ONLY choice). I'm not using a password. I'm the ONLY one to use the computer as I live alone. My previous computer also had Windows 7 Home Premium 64 bit. I didn't have that problem with it. How do I stop this login screen from appearing?