It depends what disc(s) you have for it.
Is it a 'proper' Microsoft Windows CD, or is it a manufacturer's CD labelled "Recovery"? The procedure is different according to which type of CD it is. There's even a third possiblity -- no CDs at all -- the recovery files are on the hard disk in a hidden partition and you run the recovery process by selecting "Start Recovery Process" (or some similar wording) from Start->All Programs->Packard Bell->Recovery (that's just an example from a Packard Bell laptop my daughter has).
In this last example, if Windows won't start (so you can't select Recovery from Start->All Programs) the Recovery option should appear automatically when you power up.
If you can tell us what discs you have, if any, we can help you further.
Edited by pip22, 10 February 2007 - 09:15 AM.