Hi:
You have two options...
1. Order a set of recovery disks from this non-HP vendor, as HP no longer sells them for your notebook.
2. Make your own plain W7 home premium installation media, and save the $31 or so dollars.
Click on the Windows ISO Downloader.exe link to download the tool to create the W7 ISO file download.
I have zipped up and attached the Microsoft utility below, that will allow you to either put the file on a USB flash drive or burn it to a DVD.
Then you can install the drivers and available software you need from your PC's support page.