ReactOS is free. You can boot your desktop or laptop from it. It looks like Windows (a 10-year-old version, anyway), so you already know how to use it. And it'll run some Windows and DOS applications, maybe including DOS games that regular 64-bit Windows can no longer touch. These videos even show ReactOS running Elder Scrolls: Skyrim and Doom 3.
Well now, three decades later, Kevin Savetz of the excellent ANTIC podcast has dropped a bomb on the retrogaming community: there was a real Star Raiders II under construction for a long time, but it disappeared as Atari imploded. Kevin tracked down the author, Aric Wilmunder, and convinced him to release it after all these years. You can download the game for the emulator of your choice, and read the manual and backstory on the Internet Archive.
I tried three different computers, with three different OSes. Still no change. I contacted their tech support and they said "Yes ... a lot of users complain about this. We have known about it since September, and are working on a fix! Meanwhile, we have instructions on how to use the "Fire IE" plugin to get round the problem." Eventually, I got this to work on Win7pro. (The plugin will not work on Linux). The instructions require a very old version of the plugin, and a bit of trial and error is needed to get it to work with the current one. How can a government department concerned with security not get this sort of thing right?"