asking a copy of windows to be transfered from one system to another is a bit too much to ask, you get driver
conflicts and other such issues.
you could try booting into safe mode and run driver sweep to uninstall all your old drivers
, but again its a long shot.
if you boot the pc with a copy of windows 7 in the drive it will run the setup installation wizard for you. But it will remove all your existing files and apps.
But it will move your old files to a windows.old folder.
oh and welcome to the forum