I just bought 5 computers with windows7home and am trying to upgrade to pro. the seller sold me 7pro install disks rather than upgrades. when i install them, my screen resolution is stretched and the computer no longer sees any internet connections nor recognizes any communication devices. it loads windows directly without giving me a chance to go into the bios. it did store the home version in a .old format, but i cant find a way to uninstall pro. what is happening and how do i fix it.