Is there a way to revert OSX Snowleopard to a clean fresh install? My mums laptop is not very well managed and I would like to clean it up and perform a fresh install on it and teach her the ropes from scratch as she is having a lot of performance problems with it at the moment.

Is there anyway i can reinstall it?

It is a Macbook Pro
If you bought your Macbook new then it should have come with a set of recover DVD's that look like this :



You need to locate this media and use the disk marked "Mac OS X Install DVD" to reinstall the OS. Remember to take a backup of all user data beforehand.