I have set up a second iTunes user account on my PC, but when I create the new iTunes account it copies the music, videos etc from the original account and they seem to be linked. What am I doing wrong?

Question

I have set up a second iTunes user account on my PC, but when I create the new iTunes account it copies the music, videos etc from the original account and they seem to be linked, so that when I delete a song from one library it deletes from the other one. 
On the online tutorials I've seen it shows that when you create a new iTunes library it should open as a blank account, but that isn't happening.
What am I doing wrong?

Answer 1

If you  have iTunes 11 turn on the Sidebar. Go to iTunes>View and click on Show Sidebar. You can also do a Crtl+S to show the sidebar. The sidebar is where Devices appears. and Control+B to show the Menu bar
If necessary:
iOS: Device not recognized in iTunes for Windows
or
iOS: Device not recognized in iTunes for Mac OS X