I would suggest that you install the current version FTM 2012 on your Windows 7 computer
The issue that you have is that it will not read your version 4 .FTW file directly.
To overcome this, you will need to temporarily download the free FTM 2005 starter edition. This will read your version 4 .FTW file and convert it to FTM 2005 format that FTM 2012 will read and further convert.
Once you have your file running in FTM 2012 you can delete the 2005 starter edition
Full details on this linkhttp://ftm.custhelp.com/app/answers/detail/a_id/3673/kw/unsu...
You may also care to have a look at some FTM 2012 tutorials (they are also on the FTM 2012 program CD on this linkhttp://www.familytreemaker.com/Learn/Tutorials