No Boot after running AVG Scan

Hello Jeffrey,
We are sorry for the inconvenience. You can click on this link for the steps on how to use the AVG rescue CD: http://support.avg.com/SupportArticleView?urlname=How-to-use-AVG-Rescue-CD. If you still have any issue, we suggest you to press and hold the power button of the computer for 20 seconds and then try to boot up your computer.
Thank you

Hello Jeffrey,
We are sorry for the inconvenience. You can click on this link for the steps on how to use the AVG rescue CD: http://support.avg.com/SupportArticleView?urlname=How-to-use-AVG-Rescue-CD. If you still have any issue, we suggest you to press and hold the power button of the computer for 20 seconds and then try to boot up your computer.
Thank you

I ran the scan tool and when I came back the screen is black and will not boot up.  I downloaded some AVG rescue CD onto a zip drive but have no idea what to do with it.  The instructions say launch it, but if the screen is black what do you do???