HI I HAVE RECENTLY REINSTALLED WINDOWS XP HOME SP1A BUT IT WONT LET ME
ACTIVATE IT, IT IS A LEGAL COPY AND THE DISC IS MINE. HOW DO I ACTIVATE XP?

I KNOW ACTIVATION IS LINKED TO HARDWARE CONFIG BUT IT IS THE SAME AS IT WAS
BEFORE YET IT WONT ACTIVATE MESSAGE IS...

"...THE NUMBER OF TIMES YOU CAN ACTIVATE WINDOWS WITH THIS PRODUCT KEY HAS
BEEN EXCEEDED..."