Tell Microsoft to hit the road! - The OS is Puppy Linux. This distro is still supported and built to run on older computers. It has many apps that come with it like a browser, email client, document, spreadsheet, and presentation editor, and more. IMHO it is more secure than Windows. Easy to use and learn. Low low price. It does not come with a monitor, but I have some here as low as $15 if you want to add one. This is internet ready and I can let you see it, and surf the web before you buy. Low specs but more are not needed with this OS - 504 MB of RAM, 2.8GHZ, Pentium 4, 37 GB HDD. If you have never seen Linux or Puppy Linux it is worth a look. We also have many other computers some with other versions and operating systems loaded.