Thank you so much for your support men.
Finally I mannaged to install Seven on my Epox 8RDA3+ motherboard / Samsung S-ata2 SpinPoint / AMD Barton 2600M.
It was hard and difficult, so this is what I did (maybe that could help)
First, I have formated my brand new drive into NTFS from the Drive Manager in Win XP, mounted Seven with Daemon Tools and installed it from my IDE drive running Windows XPpro onto (F

s-ata2 fresh NTFS.
Directly, Seven said it can not install on this drive because of
drivers. I downloaded 'Sillicon Image S-ata Sil 3112 for Vista' and browsed Seven to this folder.
Then, Seven copied files during +/- 10 minuts, rebooted.
I had to make (F

first boot in BIOS, unplug it and let (C

boot, then connect (F

just at the beginning of the boot sequance, wait a lot, and then let Seven boot and boot again, without unpluggin (F

anymore :-)
After that, it launched flawlessly. I have installed Antivir and Spywareblaster from my external drive, get connected to let it update.
From now, Seven has already downloaded 7 updates: for graphic, sound, PCI, S-ata... After those updates, Seven needed to be rebooted 3 times before restarting normally. But now, it's totally cool.
Again, thank you for all your help, and keep the good work.