The sound card driver of Win7 64-bit system should be digitally signed. Win7 64-bit system, there is no sound now, so you can't load the sound card driver. You need to sign it digitally.

1. Uninstall the sound card driver and reinstall the official sound card driver.

2. If it is not solved, set it. Right-click the small speaker icon in the taskbar-play device-play-double-click the speaker icon-use this device -OK? (as shown below).

3. If there is still no sound, it may be a system problem. It is recommended to change the system version again. It's gonna be okay.

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