Set Realtek HD Audio as default playback device. If still silent, try installing before the Realtek driver.
Sony Vaio PCG-61A11U drivers, Windows 7 64-bit, graphics driver, sound driver, wireless LAN driver, touchpad driver. sony vaio pcg-61a11u drivers windows 7 64 bits
* VPCCW21FX. * VPCEH25FM. * VPCEH2C4E. * VPCEB33FM. * VPCF115FM. * VPCEB2C5E. * VPCF136FM. * VPCEG37FM. * VPCS111FM. * VPCEA36FM. Drivers and Software updates for VPCEH25EN | Sony AP Set Realtek HD Audio as default playback device