That particular OEM version comes from HP. So you should ask HP if they have a download, or only a DVD and how much it will cost. It will be the system recovery media, most likely, including all drivers (nice) and all bloatware (somewhat less nice, maybe).
It's much cheaper than the retail version, that moreover comes without bloatware (nice), but without HP and machine specific driver (not nice).
The computer didn't come with a windows DVD, and i deleted the recovery partition (a stupid waste of storage space).
I have a serial number in the battery bay of the laptop, but i don't have the DVD.
Is there a way to download the OEM version of windows 7 home premium 64 bit?
My computer is a HP Probook 4530s.