To connect your P47 wireless headphones to Windows 7, you generally do not need a specific "P47 driver"
For most users, updating the computer's built-in Bluetooth hardware is the fix. You can find these on manufacturer sites like Dell Support or by searching for your specific laptop model. p47 wireless headphones driver windows 7 link
If paired but silent, ensure the headphones aren't in FM or TF card mode. Press the "M" (Mode) button to switch back to Bluetooth mode. Resetting: To connect your P47 wireless headphones to Windows