My sisters PC was running extremely slow, so I got rid of all the kack running in the background, did a repair over the top of the previous OS with her original XP installation CD.
It asked for the COA then asked for the activation key with no 30 day option, so called up the number, it was an automated voice system, I had to type in the 25 digit number into the keypad of the phone, the automated system then rattled of a new number for me to input into the PC and that was that !!
Anyway it turns out the hard drive was knackered, so I stuck in a new hard drive did a clean install with the very same XP disk, but this time it never asked for a COA or activation number, not even the 30 days to activate.
Surely the new hard drive would have given XP more reason to go through the activation stuff again ??
Windows XP Professional Version 2002 Service Pack 2
Asrock K7S41GX Motherboard AGP 8X, FSB 400, DDR 400
ATI Radeon 9200SE 128MB
512 DDR RAM DDR333
AMD XP2500 CPU 333 Mhz ( BARTON )
80gb Western Digital SD WD800JB-00JJA0 - 7200rpm Hard Drive
80gb Maxtor 6Y080L0 Plus 9 - 7200rpm Hard Drive