This is great information. I should be able to do this now. I appreciate everyones help.
Hi,  When I purchased the Latitude E5500 there was an option to go with Win XP Pro or the Vista Business OS. I chose to go with XP Pro. A few months later I received a Win 7 upgrade disk. This was about 3 years ago. I now have to give up the XP because support is ending soon. The Win 7 upgrade is from Vista to Win 7, not XP to Win 7. In my original software packaging I found a Reinstallation DVD for both XP Professional and Vista Business. Both say on the label "Already Installed on Your Computer". I would like to know how to proceed.
Need advise on best way to install win 7.