I know that the boot camp instructions state that you must have an original, not an upgrade disc, to install Windows on a Mac using boot camp. As a Windows user thinking about jumping ship, I still have some programs that will require me to have Windows on my computer, but I dont want to have to invest in a new Windows DVD to run it on a Mac. Which leads me to my question Whenever I have purchased a new version of Windows, I always start over fresh with a full system format. Normally, when installing Windows, this would require you to have a full installation CD and not just an upgrade disc. However, there is a workaround for Windows that I am curious to know if it will work with boot camp. The workaround is simple. 1) Install Windows using your upgrade disc 2) When asked for the CD key, leave it blank, effectively installing a 30 day trial of Windows on your PC 3) Immediately go through the install again, this time entering the CD key. 4) This will then install the full, non-trial, version of Windows on your PC. Basically, this tricks (although it is widely believed that Microsoft purposely leaves this loop hole available) the PC into thinking that you are upgrading from a previous Windows installation. Not knowing how Macs manage boot camp and whether they function under the same parameters, is it possible that this same trick will work on a Mac? If not, are there other tricks for installing Windows using boot camp with an upgrade only disc?