Mine is an older one,it came with Vista.My son had one with 7 on it,and it was worse than mine,if you looked at it the wrong way it would freeze up haha.I have been reading lately that some of the Satellites running 8 were never configured correctly and I am of the mindset that I have one of those. Did you get yours right after 8.1 came out? I tried VERY hard to find one that was running 7 at the time I had to buy this one but I got it during that brief period of time when you could not find a Windows 7 computer anywhere. I absolutely hate this freaking thing.