Thank you everyone^^
I just installed it because my pc is unable to log in as administrator anymore so it is better than nothing!
It took me 3hrs to download this really tiring to wait but I successfully burn it into a cd and use it at start up.
I already have the vista and windows 7 installation but I haven't installed it yet because I think my processor is not enough powerful to handle this.
But I think next year I'll buy a vista one.
Operating system is really interesting^^"
Here:
https://help.ubuntu.com/community/Installation/SystemRequirements-----
In the kindest way possible, I caution you, and any others interested in running Linux, about using Linux without doing a lot of research on your own. Finding out the minimum requirements, as an example, was as easy as searching for "Ubuntu minimum requirements".
Please understand, as you start your new adventure, that there is no customer service department to call, for someone to answer questions, and though the community is quite friendly to new users, that friendliness starts to wear out quickly, if that new user does not start learning his new OS on his own.
(Though the Ubuntu forums are friendlier than most, you can, and will get the infamous RTFM, if users perceive that you're taking the easy way out by asking questions in a forum, rather than finding the answers on your own.)
When I first tried Linux five plus years ago, I spent countless hours and hours searching for things I didn't understand. Even now, I'm continually looking things up, though I couldn't by any stretch of the imagination, be called a Linux newbie any more.
Now, all that being said, using the Live CD, as you appear to currently be doing, is just fine. If you ever decide to install Ubuntu, you've already seen the link on the desktop on that CD, to do that.