Originally posted by: seemingly random
It almost seems random. I've rarely had to reactivate and have swapped out hd's, gpu's, mb's, etc. One time I had to reactivate after a bios update.
It is by no means a frequent occurance, maybe three times in five years (all different computers). Swapping out GPUs, hard drives, and MBs definitely can trigger re-activation, particularly the MB. I think XP allows up to three cumulative non-MB hardware changes like processor, HD, RAM, video card, audio hardware, before activation is triggered. A motherboard swap by itself should trigger re-activation, unless replacing with an identical board (or a near-identical board from the same vendor).
But in those few instances, there was no reason for re-activation according to Microsoft's published criteria - the hardware configuration had not changed in months. The times that I had to call MS activation support, when asked why I was re-activating, I told them I had no idea why Windows was asking me to re-activate. Their response was along the lines of 'That's OK, it happens quite a lot.'