The most suitable distros for a total Linux dummy are Freespire, OpenSUSE, Mandriva, and Ubuntu, according to online test called Linux Distribution Chooser.
Read it here – where's SimplyMEPIS?
4. Ubuntu – Ubuntu is a free, open source operating system that starts with the breadth of Debian and adds regular releases (every six months), a clear focus on the user and usability (it should Just Work, TM) and a commitment to security updates with 18 months of support for every release. Ubuntu ships with the latest Gnome release as well as a selection of server and desktop software that makes for a comfortable desktop experience off a single installation CD.