Mark is having trouble getting SpinRite to run on his Windows 8.1 machine. Leo says that SpinRite is a great utility for evaluating the hard drive. But it can't be run from Windows, he'll have to run it from a USB key. If that's not going to work due to the format of the drive (Windows 8 uses GPT) then call Gibson Research tech support. They know a ton about how to get SpinRite working.