Here are the specs for your HP ENVY dv7-7238nr Notebook Computer. Here is the HP Software and Driver Downloads page for your HP dv7-7238nr. As you already realized, there are no HP provided Windows 7 driver for this exact model.
Most, if not all, of the Windows 7 drivers from the HP Pavilion dv7-7010us Entertainment Notebook PC Drivers & Downloads page should work on your HP dv7-7238nr.
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