if you were supposed to create your own Factory Restore disks you will have a restore partition and as soon as the computer starts booting hit F10 repeatedly and it will start the restore utility. The restore utility is menu guided so just make the selections to restore to factory condition.

This will normally delete ALL your data files, programs, etc. so if you have any data files (such as documents, pictures, email address books, bookmarks or favorites, etc.) that you do not want to loose you might consider downloading a Linux Live Cd with which you can boot the laptop and copy all your data to CD, DVD, or a USB drive or memory stick.

Ubuntu ( http://www.ubuntu.com/desktop/get-ubuntu/download also has instructions for creating the bootable CD on that link ) is a good choice but a search for "Linux live CD" will lead to may others