What Winterclaw said.

And also, Silke, in the future you might want to invest in some CD/DVD plastic cases like you can get at Wal-Mart at 50 for $3.00. To avoid scratches and all. I have, literally thousands of CD's and DVD's - music, programs, movies,  backups, and have not yet had a need to replace one. Because, you know, scratches don't just happen on their own. ;-)
And if you make copies for yourself, you can almost entirely eliminate the possibility of ever needing a replacement.