Server 2003 Key issues

I bought the MS Press book for 70-291 online. I installed virtual box on my machine today and began installing server 2003 on the virtualbox. When I entered the CD key, it said the key is invalid. I tried it a couple of times but the key is not accepted and I cannot install it.
What can I do to install it? The book is brand new and the CD was sealed before I opened it. I need it to continue my studies.
Any suggestions?
What can I do to install it? The book is brand new and the CD was sealed before I opened it. I need it to continue my studies.
Any suggestions?
Comments
Any ideas?
If you are sure you are using the correct media and key combination then call MS.
I was using the same media and key that came with the book. I had to uninstall Virtualbox, restart the machine, install Virtualbox again and then install Windows server 2003. It was wierd but it was successful. Now I can proceed with the studies.