Q: ipod touch 6th generation wont show up on Itunes (in Windows)

Do you have iTunes 12.3? You need that version and that requires Win 7 or later.

Next

First:

iTunes: Fix iPhone or iPod Not Detected in Windows 10

next try

iPhone, iPad, or iPod not recognized in iTunes for Windows

- I would start with                                                                                                                                  

Remove and reinstall iTunes and related software components for Windows 7 and later

- New cable and different USB port

Also see:

iPod not recognised by windows iTunes - ASC

Troubleshooting issues with iTunes for Windows updates

- Try on another computer to help determine if computer or iPod problem