Because I don't know of an issue that would cause this, it may be worth while to create a fresh User on that PC, then try the install again to see what happens.
Another idea: Have you tested safemode yet?
Because I don't know of an issue that would cause this, it may be worth while to create a fresh User on that PC, then try the install again to see what happens.
Another idea: Have you tested safemode yet?