Hi melmakiano, If you've changed the operating system, you would need to use the Operating System disc. If you have created the Recovery Discs when you purchased the computer (always recommended that you should create them), you use them to restore the computer. Note: This step leads to complete data loss including pictures, music files, videos, documents and applications.
Hello, When I bought the Dell Insipiron, it had Windows 7 preinstalled. Later, when windows 8 was launched, I switched to it. However, I find that many programs I need to work with do not run on Windows 8, so I´d like to get back to the original installation. How can I do this? I only have the key number but I do not have an installation cd. Thanks in advance!
PC had windows 7 preinstalled, upgraded to windows 8 and now want to get 
windows 7 back!