My wife and I have switched from Windows. I about a year ago and my wife about 6 months ago. We are using Kubuntu (Ubuntu with a different desktop). It installed cleanly and easily. For added convience and usablity we installed "Easy Ubuntu" as well.
There is also a version of Ubuntu that is aimed spefically at the educational end of things called Edubuntu. You can either freely download Ubuntu, Kubuntu, Edubuntu or if you can wait, you can request a CD or DVD and they will ship it to you free of charge, not even a shipping charge!
There is a good on-line magazine called "Tux Magazine" that is designed for the new linux user. Its about 9.95 a year but well worth it. If you like I can send you a free issue or a back issue since I saved all of them since their first issue
Whatever distro you go with have fun the linux community is here to help anyone in need of a little assistance.
Devlin