I use I quite a bit for testing stuff
It's a virtual PC (the clue is in the name) - It's a little Zen to start with - but just treat it as a PC
the next version of windows (7) will support it natively - server farms are moving to virtual servers as fast as they can.
install the prog - then create a new machine ..... the default settings are normally adequate ....
it will ask which OS - XP and how big a disc to create..... based on that it will create a PC with a HDD and RAM sufficient to run your O/s
the disc is "real" - an 8Gb disc is 8Gb in size (plus a bit)
allocate 1Gb of ram - and that's 1Gb gone from the real PC
CD/dvd usb etc are shared
after a little whizzing and banging the interface will open
and you install XP (from your "real" cd/dvd just as normal (except you won't need drivers) (if it connects to the internet you will need virus protection)
Microsoft have changed the licence to allow for virtual PCs
once that's done install your progs (you can either network the virtual PC with the real one .... or just share devices - simpler to do - more confusing to use
you can even back up the machine once it's working as you want it
(you need to back up your data regularly as well)
also It's free
http://www.microsoft.com/downloads/details.asp x?********=04D26402-3199-48A3-AFA2-2DC0B40A73B 6&displaylang=en