Turn a windows application to a portable application that can run both on a windows XP and on a windows 7(or 8) (under a non-administrator or plain end user account) that I can carry in a USB.
Sample application you can use is vmware thininstall, you are free to use other closed/open source software as well
File size of the target windows application is 48MB.
Send me your email address so I can send the application to you.