help i lent my sister my version of windows media centre edition to use on her computer but she couldn' t activate it and now her computer wont load up. what can she do. will she need to get new base unit or can it be removed from her computer?

help i lent my sister my version of windows media centre edition to use on her computer

That is illegal....
you need to re-install her version of xp: http://www.michaelstevenstech.com/cleanxpinstall.html