I have installed parallels and windows xp. I would like to install windows vista on parallels as an upgrade, so I do not lose any installed applications and settings. Is this possible? - how can I do it with safety? Just running win vista setup inside win xp/parallels? -the backup of parallels, is through the whole backup of mac os x(like superduper does), in case something goes wrong with vista install? -is there anyone who did it already? -is vista much heavier and slower in parallels than xp? What should I know before proceed to this upgrade?