Even though the driver is signed, old SHA-1 signatures may be blocked by later Windows 7 updates.
If the official download is hard to find: Driver Avermedia A857 Windows 7 64 Bits LINK
Finding the correct driver for the tuner on Windows 7 64-bit can be tricky since the hardware is often bundled with specific laptop brands like Positivo or Lenovo . Primary Download Sources Even though the driver is signed, old SHA-1
I have scanned this driver pack with Malwarebytes and VirusTotal. It is clean. However, always verify the hash of your download. It is clean
To ensure smooth HD playback (MPEG-4 H.264) on Windows 7, your system should meet these minimums: : Intel Core 2 Duo 2.4GHz or AMD Athlon 64 X2 2.8GHz. RAM : At least 1 GB is required for live HDTV viewing. Graphics : VGA card supporting DirectX 9.0c and HD DXVA. How to Install the Driver Manually
and point it to the folder where you extracted the downloaded files. Important Note on Compatibility