There's a preview released of Windows 10, for developers. I downloaded it, managed it to work, shut down got an error, started right after and all my partitions were gone.
And again, Microsoft messed up my hardware
http://i1.kym-cdn.com/photos/images/facebook/000/617/851/56d.gif
But that's not the strangest. I also had Ubuntu .iso, I deleted every partition (all were "crashed") and installed Linux on my computer, I tried to install MS Win 10 again, but it wouldn't let me, so I thought, well, let's return to our old friend Windows 8.1, but nope, it can't be installed either. It prompts error that files are corrupt and until I provide complete files, setup can't continue. This is not a question, but this is a warning for everybody out there, don't test software on real machine, just try it on VM instead.