I am a Nero employee and would like to help you.
Unfortunately, Nero 7 does not offer official support for Windows 7. If you would like to use Nero under Windows 7, you can upgrade to Nero Multimedia Suite 10 and save up to 20% compared to the regular price by visting the following page and entering your current Nero 7 serial number:http://www.nero.com/deu/store-upgrade-center.html
If you need additional assistance, feel free to contact our customer support:http://www.nero.com/eng/support-form.html
Or seek for help in the My Nero community:http://my.nero.com