Thank you for your help deMangler, but I use an other virtual machine call "Microsoft virtual machine" available freely here : hxxp: www. clubic. com/lancer-le-telechargement-256894-0-microsoft-virtual-pc-sp1-2007. html (sorry, I am french, so I have a french link, but it's quite simple, click on "lancé le téléchargement" which mean "launch the downloader", then you just have to instal it as an other software). It's totaly free.
It propose you to create a virtual machine which will have characteristics near the exploitation system you want (for exemple, if you want windows xp, you will nead at least 128 Mo of RAM and 60 Go of hard drive (I think not necessary, it's just an advice. I use only 20 Go, and it's quite enough)). After it, you have to instal your system in it. No need to create a vmd or ISO or something else if you have a CD.
I thought it's easier, but it's just my feeling. It depend on what is more intuitive or not, for you.
Now, it work very well. 1280x1080 (somthing like this) with a beautifull scroll bar (not really, but it was what I waited for, and this solution give me it, so I am happy about it) which allow me to see what I could not see before. I had just a problem with a dll forgotten (error 743, if I remember. I was not able to use the F9 windows), but I solve it here with a strange way, but it work well now (thank you, you are a really good community, it's pleasant to have such help like this ^^)
So, it'll be good for people who will have the same problem to have multiple solutions. If one doesn't work, maybe an other will work, and if one is too difficult, an other will be easier.
Thank you again.
P. S. : just one question. Is it important to have protection on the virtual machine (I mean firewall and antivirus), without direct connection on internet ? (I mean, the only way is my real PC which have these protection with the connection)