It's just because you're used to Windows.
Mandriva 2006 will be patched, at least eventually. All OSes get patched, if only for security reasons. But with Mandriva, (and most Linux distros) you can keep it up to date automatically, and *never have to reboot your system* to do so.
Mandriva 2006 comes with KDE 3.4, and Gnome 2.10, two of the best desktops around, in versions *just short* of the bleeding edge. They're old enough to be stable, yet new enough to be current.

Both desktops are as good as, if not better than, the standard Windows desktop. (Personally, I like KDE, but it's an individual choice.)
If you go the Mandriva route, I will let you in on a not-very-well-publicized site that lets you legally have access to
all the non-proprietary software available on the 6-CD Powerpack version. (It's not well-publicized because Mandriva would rather *sell* you the full 6-CD set.

)
As for your questions, feel free to ask here, but don't forget to check out
LinuxQuestions.org. (Also, for Mandriva,
Mandriva Users Board, the non-official, but
better, Mandriva support site.)