Hi All, I read some articles and know that I should back up 2 files wpa.dbl and wpa.bak in Windows XP after activating online.Just in case I re-install Windows XP ..... I do not need to activate again if I restore these 2 files. I just re-install Windows ..... I restore 2 files wpa.dbl and wpa.bak ... But it still requires Activation Online. Does Anyone know what's wrong with me ? Thanks so much for your help and suggestions.