opening winxp pro download file.

Good morning!. thank you so much for all of the info you have given me. I have one more question. I downloaded your peer to peer free winxxp pro program. it is now where it is supposed to be, in c program bitcom downloads windows xpsp2. being the file is so large, could you tell me that when to go to open with program, which program i need to open. i am still a rookie at this. Thank you. bill bwillia7@