Is there a way to get Finder on Windows?

On Macs running Catalina or later, iTunes is no longer used (Finder is used instead) but on Windows computers iTunes continues to be used for everything as it was before. There is no way to install Finder on Windows.

Sorry, I don't know much about iPod Nanos. Try posting a question with a title about resetting it via Finder in the iPod Nano forum: iPod nano - Apple Community

Resetting an iPod nano means turning it fully off and then on again (as opposed to simply putting it to sleep). Usually, if an iPod is behaving in odd ways a Reset will fix it.

If resetting your iPod does not fix the issue, the next recommended step is a Restore, which is totally different (and as far as I recall from my own nano, still an option in iTunes). To Restore an iPod, connect it to iTunes and click on the device icon when it appears in iTunes:

That displays the Device/Summary pane and you will see the Restore button on this pane (the screenshot below shows my iPod Touch, but the iPod nano will show a similar screen, but without the iOS bit):

Note that a Restore will remove all the media (all your music) from the iPod. Any music that is not in your iTunes Library will be lost.

You do not need Finder.

However, if all you actually want to do is remove your music so that your brother can add his own, simply Sync (synchronise) the iPod with the iTunes Library he is using, or if you are sharing one iTunes, his selection of songs. That does not require a Reset or a Restore (or Finder).

AnonymousMoose289 wrote:

I heard that they switched it so you need to reset it in Finders instead of iTunes

That is not the whole story - iTunes still exists:

• • for all Windows machines, use iTunes
  • for older versions of Mac (running OS Mojave or earlier), use iTunes
  • on a Mac running OS Catalina or later, there is no iTunes. Instead, one uses Finder (for all iPods)