I bought 2 - one for me one for the Mrs. These are the 3rd & 4th refurbs I have bought at Amazon. (I bought one for my mom a couple of years ago.) Unlike my prior experiences with different vendors, both machines can with Windows Pro installed an authorized. Both operate flawlessly. One came with only 16MB of memory, so I contacted tech refurbs and the only question they had was what configuration was the existing memory card? they're sending me new memory cards. I'll change my rating to 5 stars as soon as the memory cards arrive.Very happy with them. They are screaming machines. We don't game with them, but we run our business on them.