How to burn CD with Itunes?

Hello to all,
I just installed the latest update of iTunes version 8. Since then, I can not burn songs downloaded. The following message appears, when the software recognizes my recorder when I enter a blank CD. My drive is recognized by my system I have some burned in cd with Nero. I uninstalled and reinstalled iTunes but the same error message reappears.
Has anyone already faced this problem? Thank you for your answers

iTunes is great for playing your tunes on the computer, and the iPod is the undisputed champion of playing personal on-the-go music. However, none of us can fully escape the need for “old-fashioned” CDs every once and awhile--we use them to listen through other devices, share with friends, and backup our music collections. iTunes can help.

Configuration:
To get started, you first need to select the type of CD you would like to burn. Go to iTunes preferences and select the burning tab.
Choose your burning format according to your purpose

The following is further detail about the three burning options:
Audio CD: This is your standard CD. Its main advantage is that audio data is written in a format that is readable by virtually any audio CD player. As one can expect, however, you can only fit 74 minutes of audio using this option.

MP3 CD: This option burns a playlist to a CD, copying the files as MP3 files, rather than audio tracks. If there are any AAC or Protected AAC files in the specified playlist, they will not be included on the CD. This is advantageous for burning CDs for use in MP3-capable portable CD players or MP3-capable car stereo CD players, because these devices do not presently support AAC.

Data CD or DVD: In a data CD or DVD, *all* songs in a playlist, regardless of file type, are burned. This option is the best to choose for a backup for two reasons. First, all of your songs - including AAC and iTunes Music Store Protected AAC files - will be backed up. Second, the “Data” option allows you to burn to a DVD-R disc, which holds approximately 5 times as much data per disc (DVD burner or Superdrive required).

For more information go to this link.

Itunes will not burn songs for the following matter:

Songs not authorized
iTunes will stop burning a disc if one or more of the songs in a playlist were purchased from the iTunes Store but are not authorized to play on this computer. This message appears:

"One or more of the songs in this playlist are not authorized for use on this machine. Authorizing this machine to play these songs will allow them to be burned".

Too many songs in the playlist
If there are too many songs in a playlist to fit on a single CD, iTunes asks if you want to burn multiple discs or cancel the burn. This message appears:

"The songs in this playlist will not fit on one Audio CD. Do you want to create multiple Audio CDs with this playlist split across them? This will require more than one blank CD to complete".

1. Open iTunes.
2. Create a playlist, (File, New Playlist) which should appear on the left hand side menu. Rename this (optional) by clicking on the playlist that appears.
3. Select the songs that are desired. Click on the first one, and then hold down Ctrl (bottom left of keyboard) to select multiple tracks. To deselect a track, continue holding Ctrl and simply click on the song title again.
4. Once all the desired tracks have being selected, release the Ctrl key and drag (by clicking) the songs over to the playlist created. The songs will now be in the playlist folder.
5. Insert a blank CD-R/CD-RW disc, and wait until the disc is recognized. Usually, Windows will open a menu with options to view folders, or burn a cd with any pre-installed CD burning software that may be present on your system. Cancel these options, and return to itunes.
6. In the playlist folder created, there will be a burn cd option at the top right of itunes (it looks like a nuclear warhead symbol).
7. Click this, sit back and relax until the CD is burned. This will be announced by itunes.