iTunes audio comes with DRM (Digital Rights Management) attached. You need to remove the DRM first (Google: DRM Remover and download one).
Once the rights have been removed, you can use the audio in Windows Movie Maker because the files are usually in Mp3 format anyhow. If not, convert the file to an mp3 before you import it for use.
Macs come standard with iTunes. For Windows computers, iTunes can be downloaded for free at http://www.apple.com/itunes/download
You need to either convert it or find a different source for music where you can buy mp3's. iTunes music downloaded will not show up on the mp3 player.
if you have downloaded the itunes back. you have convert the itunes to the format ipod nano supported.
If you bought it then reinstall it through Itunes. If you downloaded it and didn't back-up, re-download it.
Your songs on iTunes are sound files. If you downloaded them from the iTunes store, they are .m4a files. If you downloaded them from elsewhere, they may be in a different format, but they are still sound files. To locate the files on your hard drive, simply right click on a song on iTunes and click "Show in Windows Explorer" (at least on Windows).
Yes, they can as long as you manually place the file into the mp3. Also you have to convert the file you downloaded into mp3 format.
You shall convert them.
You'll need a MP3-capable receiver, and will need to convert your CD's either in Windows Media Player or iTunes.
On Windows pc's, as far as I know, yes. I got it for free when I downloaded iTunes.
You should only use the latest version of iTunes downloaded directly from Apple's iTunes download page (See links below). If you are running Windows 7 in 64 bit mode you will need the 64 bit installer (see link from above page).
I will use media converter to convert Windows WMA/WMV files to iTunes supported file formats like MP4, M4P, M4A, MP3.
TV episodes downloaded through iTunes can be imported into Windows Movie Maker as long as they are not protected by DRM (Digital Rights Management) and contain a .dvr-ms file name extension.