Windows Xp Activation help required

HI,

i have windows xp original and i want to backup its activation ON THE SAME MACHINE that means generally i need to install

xp many times due to virus and all that in a month etc, so everytime it doesnt activate with microsoft.com with

the same key (there is limitation for a key for number of activation done).

so is there any way to backup activation so that i can activate xp on same computer with same

configuration offline without internet many times AFTER ACTIVATING ONCE

WHAT I DO AS FAR IS THAT

i backup SYSTEM32>wpa.dbl and wpa.bak after original activation from microsoft and make a copy of that and after some time i install fresh xp with the same key i used before , i restore the both files previously copied from SYSTEM32>wpa.dbl and wpa.bak in new formatted installed win xp system 32 folder but

IT DIDNT WORK THE WINDOWS ASK ME FOR ACTIVATION

"since i added 1gb ram after backingup both wpa.dbl and wpa.bak, IS IT SO THAT THIS THING WONT WORK AFTER ADDING RAM I.E HARDWARE CHANGE"

any how i want to get rid of this activation again and again on same PC.

please give your valuable replies and solutions

u need window xp cracker i will give u the link later