@rocksteady... Thanks for your quick reply!
On your questions: yes I have some experience, from Windose 2.0 via 3.11 (WfW) to "Se7en"; but almost got insane from this OS. In the last millenium Apple OS 8.2 Classic, crossed my path, and stole my heart...
Furthermore I installed Suse Linux and Mandriva on a PC years ago and recently Ubuntu on a VM driven by OS X (piece-of-cake with VMWare on SnowLeopard)...
Your remark about a second HDD would be the best solution, but I built a PC with a mini-ITX case with a Intel D945GCLF2 motherboard and an Atom330 dual core CPU, 2 GB RAM (max), 320 GB HDD, without DVD (yet)... There is no more space inside the case for whatever piece of hardware... Except a slimline (Sony) DVD burner...
I used a bootable USB-stick to install Win7... So that is (for the moment) a further handicap... Ergo I have to deal with 1 HDD, but I learned Mrs. Bouffski to backup all her data on my FTP-server on the Internet, so that hurdle has been taken...
As I promised, I will do my homework (tomorrow), now I need some sleep!
Cheers & thanx again