I am using Windows 8 with iTunes. How do I manage iTunes with two different Windows User Accounts?

Question

I have recently bought a laptop running Windows 8 and downloaded iTunes.  I subscribe to iTunes Match and have a large amount of purchased music and imported CDs, along with some films purchased from iTunes.
I have downloaded all of the music and the films to the laptop using iTunes Match when logged in under my User Account in Windows 8.  However, when we switch to my girlfriend's User Account, she can load up iTunes but all the music and films have the cloud symbol on them indicating that they need to be downloaded
Is is necessary to download everything to the computer twice (I can't really believe this is the answer) or are we missing something in terms of using iTunes with two different User Accounts?
Thank you.

Answer 1

Step 1
Create a new user account on your device. For Mac users, choose “System Preferences” from the Apple Menu and navigate to the “View” menu. Click on “Accounts” and select the “+” button to add a new user account to your machine. Edit the user information and grant any relevant privileges by following the on-screen prompts.
For Windows users, click on the Windows "Start" button, select “Control Panel” and choose “Add or Remove User Accounts.” A new window will open. Click “Create a New Account.” Name the account and set any relevant privileges by following the on-screen prompts.
Step 2
Sign in to the new user account you created.
Step 3
Open iTunes and click “Sign in.” Enter your Apple ID and password and log in.
Step 4
Download purchases through the iTunes store. All files related to these purchases are stored under the separate user account, thus separating both iTunes accounts and their libraries on the same computer.
Step 5
You can share music from both libraries by dragging your music library to a publicly accessible location on your computer. Click “Preferences” from the iTunes menu and deselect “Copy files to iTunes Media Library when adding to library file.” Add the shared folder to your library from the “File” menu.
Tip
Create more than one library from the same user account by deselecting “Copy files to iTunes Media Library when adding to library file” from the “Preferences” menu. Add the files you want to iTunes by dragging and dropping or by opening from the “File” menu and sync your device to that library. Quit iTunes after the sync and reopen iTunes while holding the "Shift" key in Windows or the "Option" key on a Mac.
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