If that is not possible, then look for a sticker on the PC that includes the product number and post that here.
Also, WHY are you trying to install Win7 now? Did the system crash and you are trying to restore it?
Also, where did you get the media you are using? Is this a set of HP Recovery Media disks you purchased from HP? Is this a set of recovery disks you made yourself from this PC? Or is this a DVD you made from an ISO file you downloaded, or a Microsoft Windows DVD?
We can proceed once you provide the information.
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