I have a Windows Vista with Windows 10 installed; is it possible to install Xbox one S for...

Yes, the fact that I have Windows 10 installed on Vista

I'm not sure what you mean by this. You've either got Windows 10 or you've got Vista. Please tell us what you have and what the age of the computer is please. If you can, please provide its make and model.

To illustrate a point, everyone knows how terrible Windows Vista was. My old laptop use to have Windows Vista. I installed Windows 7 on it, and the hardware was at least 2x faster and got much better performance. Start up and shutdown was far more quicker.
Far less memory hogging in Windows 7's task manager than Windows Vista. I'm not saying that the 3 OS's on Xbox 1 (Xbox OS, Windows kernel, hypervisor) are bad. But it does need improving. Say you could have Windows Vista on a PC with an Intel Core i5 of i7
processor. It's still going to give poor performance because of the software/OS than if you have Windows 7 or better on it.

Do you have Windows XP, Vista or Windows 7 installed on your computer?

First of all, why are you using Windows Vista? If your drivers aren't installing, there's another problem. Drivers are normally detected and installed automatically. I'm not sure if your dongle is supported by Windows Vista, or Windows 7 for that matter,
though I could be mistaken.

So what you're saying is I can download and play Anywhere games on my windows Vista as long as I have the xbox app installed on it, right?

As per XBF Amber M's reply. You can't download the Play Anywhere titles on Windows Vista, you need
Windows 10

Although to be honest, if your computer is running Windows Vista, it's probably a very old machine. It won't have the hardware requirements to run any of those games anyway.

What make and model is your computer?