Put the computer back into your dad's computer and start it up. navigate to C:\Users\ and right click on his user folder selecting properties.
click the security tab.
type "everyone" then click okay
select the everyone group and place a check mark in read & execute.
download kubuntu from kubuntu.org/getkubuntu
download linux live usb creator (Lili) from www.linuxliveusb.com/en/download
Use Lili to create a bootable CD / DVD / USB thumbdrive that slices through protection like it wasn't there.