To add to Microsoft's statement posted above, the preview is for IT professionals first and foremost. If you don't know how to do a clean install of Windows, create and revert back to a Restore Point, back up save your files to local or cloud media, or have any less than intermediate knowledge of computer repair, then no, don't install Windows 10. As it is right now, Windows 10 is absolutely not for everday use for regular computer users.