|From what I can read, you should of had Recovery CD's that came with your laptop.|
Once to that website, determin your exact model number. Once you click on it, look for "Setup and Install" Then on the next page "System recovery" Once on the next page "Using HP Backup and Recovery Manager"
That should give you a step-by-step on recovering your laptop.
AMD Phenom II X2 550 @ 3.11
Patriot PC2-6400 4Gig
Seagate 160Gig SATA
Seagate 320Gig SATA