Hello there AliWonder,
Heres a great bit of info about how to add content to iTunes.
Adding music and other content to iTunes
Adding content on your computer to iTunes
iTunes helps you add digital audio and video files on your computer directly to your iTunes library. You can add audio files that are in AAC, MP3, WAV, AIFF, Apple Lossless, or Audible.com (.aa) format. If you have unprotected WMA content, iTunes for Windows can convert these files to one of these formats. You can also add video content in QuickTime or MPEG-4 format to iTunes. To learn how to add these files to iTunes follow the steps below.
- Open iTunes
- From the File menu, choose one of the following choices:
- Add to Library
- Add File to Library
- Add Folder to Library
- Navigate to and select the file or folder that you want to add
If iTunes is set to "Copy files to the iTunes Music folder when adding to library," iTunes will copy all content that is added to the iTunes library to the iTunes Music folder. To adjust this setting or change the location of this folder, go to the Advanced tab in iTunes Preferences.
Thanks very much - yes I finally figured out the totally weird 'Add files to Library' - even though they are already IN the iTunes folder... This only happens with certain downloads, which is what confused me; downloads from Amazon appear straight in iTunes. This is all so much simpler in Windows Media Player...!