Sometimes when you reinstall windows the customer can not find their installation CD. Assuming the computer can boot and all you need to do is reformat. Then you can use the program "Jellybean Keyfinder" http://www.magicaljellybean.com/downloads/KeyFinderInstaller.exe to locate and write down their existing Microsoft Office serial and which version of Microsoft Office they had. You can then use one of the links below to download a trial version of Microsoft Office that corresponds with the