Mandriva One Installation or other

Hello, I was looking for a Linux OS for beginners. I have worked in Redhat about 4 years ago but I was just a user, I didn't actually do anything of value on it and my use was very limited.

I have an older machine running a 20gig hd with WinXP

I would like to explore the Linux route so I looked up Mandriva One 2007. However I read the review by srlinuxx and it has scared me somewhat.

My question is..

Is Mandriva One the right choice? or is there some other Linux version that would be suggested?

I have never installed an OS before.

My purpose is purely educational. I want to learn about Linux in a first hand experience. I would prefer a version that can be run from a cd.

Thanks in advance
Jason