Q: iPod Touch is not recognized when plugged to computer. Just beeps every second.

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

Removing and Reinstalling iTunes, QuickTime, and other software components for Windows XP

or                                                                                                                                  

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