Where does iTunes file music library on Windows 8.1?

I have a new Windows PC with Windows 8.1 and having file location issues after downloading the latest Windows version of iTunes and importing:

- All songs are now duplicates and my playlists were not imported. Please no Windows vs Mac is better comments. I have been using Apple products for years...iPods, iPhones & Macbooks, just prefer using Windows as my OS for my primary PC where all my music is stored and transferred to my Mac devices.

1. My new PC has a solid state hard drive - C:/

2. All of my music files from my old PC are stored on drive E:/ (This is where I am supposed to store all my personal files) according to the tech who set up my new PC.

Here is an example when I right click on song and get song info > file location for each of the duplicate files:

- First Duplicate Song: E:/Rhonda\Music\iTunes Media\Music\artist name\album\song name.mp3

- Second Dupe Song: E:/Rhonda\Music\artist name\album\song.mp3

Regarding missing playlist issues: When I do a search to try to locate any .itl files (Playlist), they show to be located in c: users\owners\music\iTunes - not sure if this file contains my playlist or not; however there is also a folder called "Previous iTunes Libraries"

It would also be helpful to know what the standard (default) location / path is for iTunes files on a Windows 8.1 PC?

Thank you