It pops up with an error saying that it only works with things that support (x64). Idk what that is. I had it on this computer when it was in windows 7 and 8. This error is something that I am confused about.
It means your computer's processor is 32-bit instead of the required 64-bit.
The reason the error shows up now, is because the newest version of RoR (2020.01) no longer has 32-bit support.
It may also be that you have a 64-bit capable processor, but a 32-bit operating system installed. It's possible to check (you look up your processor model and see if it's 64-bit capable and if it is then re-install a 64-bit version of Windows) but it's a lot of work and complicated, you'd need someone who knows how to do this, to help you.
Alternatively, you can download and play an older version of RoR, version 0.4.8.0-RC5 is apparently the last release with 32-bit support.
32-bit only processors haven't been manufactured since 2005. It's very likely you just have a 32-bit OS, as OEMs tend to install them for some reason. Your only supported options are to reinstall Windows or use a different PC.