Have a corrupt Microsoft Office CD/DVD or no CD/DVD in your current PC, you can find a replacement ISO to download.
I do not vouch for nor guarantee that any of the following links are safe or will not harm your PC. They are for my reference as I occasionally need an old version for a clients PC.
- Office 2013
- Office 2010 + SP1
- Office 2010 Professional Plus SP1
- Office Home and Business 2010
- Office 2007 + SP3
HeiDoc.net have a Microsoft Windows and Office ISO Download Tool, which will assist you in downloading 2013 and newer versions of Office.