Hey, so recently I wanted to play some older games that did not work on any windows 7+ so I wanted to install windows vista as a multiboot system, now I saw that there was this warning: WarningYou must install the older operating system first, and then install the more recent operating system. If you don't (for example, if you install Windows Vista on a computer already running Windows 7), you can render your system inoperable. This can happen because earlier versions of Windows don't recognize the startup files used in more recent versions of Windows and can overwrite them.is it still safe for me to do so if I have windows 10 first? do I really have to delete my windows in order to not corrupt my pc? please help, I've been trying to do it for around 3 days (still not very good at messing with it) and i just want to make sure I won't mess this up as it is important to me but.. deleting my windows with everything on it seems a bit too much for a few childhood games, but I might, just might do it anyways.