IRQ conflict or corrupted registry. Fix: Move the card to a different PCI slot. On motherboards with multiple x16 slots, avoid the primary GPU slot.
The A857 uses an older WDM (Windows Driver Model) framework. Use Windows 7 compatible software : Driver Avermedia A857 Windows 7 64 Bits LINK
Since the official AVerMedia global site primarily lists newer capture cards, you may need to use archived or third-party repositories. Below are the most reliable options for Windows 7 64-bit: Lenovo Official Support IRQ conflict or corrupted registry
: If you are unsure if you have the right driver, the A857 typically uses the ID USB\VID_07CA&PID_A857 USB\VID_07CA&PID_0857 Do you need help finding TV viewing software Driver Avermedia A857 Windows 7 64 Bits LINK