Summary: It came with Windows 7 Professional. I kept it bu I partitioned the 1tb drive and installed Pinguy Linux so now it is a dual boot system. It functions perfectly. It's fast and does everything that I want it to do.
Summary: I bought this computer as a present for a family member that just needed a simple machine to do some basic internet searches. The computer was not immediately required by my family member and they waited about nine months to finally set it up to do some internet exploring.
Cons: The computer was dead on arrival, unfortunately we did not discover this until the machine was out of the return policy time frame.