|It was not a very wise move to install software like that without first having a system in place to restore Windows to the way it was (such as a backup image).|
You will have to hope that Factory Recovery works. This will re-install a fresh copy of Windows as it was when your laptop left the factory, but everything that's currently on the drive will be over-written.
If you have a set of recovery CDs, use them. If you don't, order a set here: