new hardrive in my Toshiba l455-s5045 put Kubuntu on it now i want Windows 7 back

Your thread title ran out of space before we get to find out what actually happens.

I've edited it down into your post but please post back what happens next.

At a guess, I think the best way forward is to clone the Windows system from your old hard disk to the new one. That way you get all your programmes and personal data back.