I have just purchased a barebones sysytem, a case, processer, memory & a motherboard. Is it just wishful thinking that I can just put my old hard drive with XP etc on it and it will work. Do I have to format and load from scratch?
I've done it in the past Martin12 but be aware you'll have some driver issues. In all truth though it is better to do a nice fresh and clean installation, bearing in mind you will probably be keeping the machine for some time.
I have done just that with my brother-inlaws PC, the MoBo died and I could not get hold of one exactly the same so I just put in a different one and as I expected iXP home wanted re-activating so I phone Microsoft and explained and after assuring them that it the software was only on that one machine they gave me a mile long actvation code.