You would have to figure out the file format that excel saves to and then read it with php. I would recommend saving your excel doc as csv (comma separated values) and then parsing that in php would be no problem.
you can acess other computer
1st you need to configure hardware properly .that is a proper wire is connected through ethernet.
then configure the ip and dns which you want in sharing.
check frm cmd command "ipconfig" wheather it pings client or not
once windows 7 is installed in your system.your xp or any other OS will be corrupted and it will automatically boot windows 7.
Kindly correct me if i am wrong