RE: Conexant Audio CX20641 driver for Win 10 64 bit - Inspiron 620
There isnt a win10 driver and never will be. You have to download the windows 7 driver.
Conexant CX20641/CX20651 Audio Driver This package provides Conexant CX20641/CX20651 Audio Driver and is supported on Inspiron Desktop 620 and Vostro Desktop 260/260S that are running the following Windows Operating Systems: Vista and Windows 7.More details
Windows 7 64-bit Windows Vista 64-bit Windows 7 32-bit Windows Vista 32-bit