HI Mandy,
I recommend Family Tree Maker and I currently use version 11. You can get it from www.genealogy.com It costs of course. Check the site. If you are looking for a freebee, then you can get Personal Ancestral File (PAF - dont know what the current version is) from www.familysearch.org I know lots of people use this and find this satisfactory.

Good luck with you research

Elizabeth