...Tim...

Well, in the end that's not entirely true. While to avoid potential conflicts with third party software it is strongly recommended to use a fresh install when using USBoot this in no strict requirement. In fact I myself do use it on my productive install with the full BTS driverpack proivided as source for step V of phase II. However the possibility of (unwanted) complex driver interaction grows as the number of factors involved increases. So for a first try I would certainly give the advice to use a 'virgin' install of NT 5.x but once one has successfully proven that the system in question is capable of booting from USB it may be worth a try to reevaluate things with a full blown installation. Tim