So first of all hello to everybody and ty to who ever can guide me or give me some tips I have a PC [actually is my nieces PC] that has a dual core E5200 and 1GB Ram so Windows XP is enough for it. I am about to format all the HDD's on the PC and do a clean install. I will use this ISO >> en_windows_xp_professional_with_service_pack_3_x86_cd_vl_x14-73974.iso So i know all the steps i must do to reinstall it but my question is: How do i save the genuine details of the current OS and auto-copy it/enable it on the new install ? I did read " The Windows XP Repository " and found out how to make a installation Genuine but what if i will use the bios of another model on a different pc? [ i did that method with the OEMBIOS LIST and found the values that are the same with my BIOS but what if i take that iso on a pc that has a different mb?] Like what must i do to use the en_windows_xp_professional_with_service_pack_3_x86_cd_vl_x14-73974.iso and keep windows genuine no matter on what pc i install it? Ty and sorry for my english,and sorry for any trouble. If you need more info feel free to ask and if i may know i will reply.