Several free alternatives to Microsoft Office are available and each has the ability to view and edit your existing Microsoft Office Word, Excel, and Power point documents.
KingSoft offers an alternative office suite that have been reviewed and approved by PC World Magazine and is my 1st choice. When I have inherited a laptop I usually restore the computer to factory defaults, uninstall the Microsoft Office evaluation suite and install KingSoft from WPS.com. Download Link
LibreOffice – We were introduced to this office suite when using Linux instead of Microsoft Windows as our computers operating system. Libre Office also offer a Microsoft Windows compatible version that is just as robust and can be downloaded from www.libreoffice.org. Download link