It`s a sign that the lazer of the drive is starting to fail to read the disks you put in it.
You can try a lense cleaner disk if you have one and it may fix the problem due to a dirty lense.
If it does not work, then its time to think about buying a new DVD ROM/ WRITER DRIVE.
For all your software and hardware check the
Windows 7 Compatibility site: (There you will find out about hardware and software compatibilty.) http://www.microsoft.com/windows/compatibility/en-us/de...
There is a pulldown from which you can choose "hardware" and "software".
Microsoft does have an official Windows 7 Support Forum specifically for IT Pros located here http://tinyurl.com/7jq7ps . It is supported by product specialists as well as engineers and support teams. You may want to also check the threads available there for additional assistance and feedback.