Q: My cd won't launch? I have tried using quicktime7 nothing help

Another help source (if you haven't already done so).

Go to your OS Help Menu.  In the search field type dvd

Click on all the troubleshooting topics & Support Articles that pertain to  your issue.

You can also do the same in Disk Utility.  Open same up.

At the bottom left of the window, click on the purple button w/the "?" in the middle.

This will bring up the Help Menu.

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Try a different brand.  Top forum favorites

CDs

FUJI

TDK

Verbatim

DVDs

Maxell

Verbatim

Make sure the DVDs are not dirty, smudged and/or scratched.

http://docs.info.apple.com/article.html?artnum=50448  How to Handle and Clean CD and DVD Discs

Your drive may need cleaning.  Cleaning kits can be purchased from any store that sells CD/DVDs.

Check out the following KB Articles: http://support.apple.com/kb/TS2288 Troubleshooting a CD-ROM or DVD-ROM Disc That Does Not Appear on the Desktop

http://support.apple.com/kb/HT2801 Apple Portables: Troubleshooting the slot load optical disc drive