Attention all PB Computer Wizards: I have an old Dell Inspiron 1764 that I purchased back in 2012. It has Windows 7 currently installed as the operating system. I would like to replace that with a free operating system so that my wife can use it for some web-based activities such as: web browsing (Facebook, Etsy, etc.). I am not overly technically gifted - I know just enough to be dangerous - so I'm looking for something as close to plug and play as possible. What would be some good options that would also be reasonably secure and easy to use? Thank you.