Yes, it works on just about every WIndows version (I know for sure that it works on Vista, 7, and 8). It's some really useful software to have. I have it on my laptop and desktop, and I run the program on a schedule (usually once a month) just to make sure that everything stays neat and tidy. Since I began to use this software, I have been able to see a huge difference in my computers performance. It runs so much faster, my internet browser runs faster, and my start up and shut down times don't take nearly as long as they did. I'm just happier overall with my PC since trying PCHB. The scans are really quick and thorough, so you really only have to run it every so often. Good luck!