Currently I am running my One on Windows XP Professional using a license from a discarded PC I had and I am very happy with it, but I keep getting this nagging feeling that I would like to try Vista. I have tried VistaMizer and the Brico packs to get a Vista feel, but it’s just not the same as the real deal. I also have a Dell Desktop that came with Vista Home Premium and a HP Laptop which came with the same. Now for the tricky bit...... license keys. I have been reading up and there seems to be some kind of loophole in that when a PC/Laptop comes supplied with Vista its OEM and therefore already registered/activated, because of that it can be installed on a second machine and activated without issue. Am I right in my understanding or have I totally got it wrong. If I then activate/register it, is the fact that all the hardware would be totally different to what it was initially installed on going to set off alarms bells at Microsoft and cause a knock at my door? I know the recovery CD for the Dell has a full version of Vista on it as I have already totally wiped/formatted/installed it several times, so could I use this? I would rather use a key number that I have myself than one that I can find via other means.... Google searches/torrents etc. Would appreciate any comments :)