Hi, I have a Lenova Thinkpad model SL510 that I purchased almost 3 years ago, brand new right from the factory. It came with Windows 7 Professional 32 bit operating system. I have never reformatted the laptop, never touched the os. I ran a microsoft diagnostic tool but I don't understand the results: and don't know if I'm allowed to post it here. I called Lenova but since the computer is out of warranty, they can't help me. I hope someone here can help because I can not run updates, especially for microsoft security essentials.