I want to install another Windows 10, so I can have two. I want to use one to "test" different things (such as some programs that could contain malware, for example). If something happens to the "test" version of Windows 10 and I have to reinstall it, I have to reinstall my "main" Windows too(because I don't want to lose any data from it)? And I can put both Windows 10 on the same SSD? I don't want to use a virtual machine because my PC is pretty old and slow and the virtual machine isn't performing very well.