While you can often install a newer version of software over an older version, you might well get an error message if you try installing Works Suite 6 when Works 7 is already installed.
Uninstall Works 7 first and then install Works Suite 6.
<<Does anyone know if Works 7 is much better than Works 6?>>
I have Works 2000 and Works Suite 2003. The basic "Works" applications (word processor, spreadsheet and database) look the same to me. Obviously the newer version will have compatibility with newer versions of MS Office.