There's no Realtek in Device Manager

If we are working with the board in your specs, then it has no realtek audio, it has VIA VT1718S. The ATI audio device it for the HDMI connection on the graphics card.

Is your audio inoperative?
 

My Computer My Computer

At a glance

Windows 7 Ultimate X64 SP1Intel i5-2550K, Differing ~4.4-4.8GHz No buil...16GB G.Skill Sniper 1866MHz @ 2133MHz 2x8GBASUS GTX650TIB-DC2OC-2GD5, (650TI Boost)
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Home Built Desktop By DataTech
OS
Windows 7 Ultimate X64 SP1
CPU
Intel i5-2550K, Differing ~4.4-4.8GHz No built in GPU
Motherboard
ASUS P8Z68-V PRO/GEN3
Memory
16GB G.Skill Sniper 1866MHz @ 2133MHz 2x8GB
Graphics Card(s)
ASUS GTX650TIB-DC2OC-2GD5, (650TI Boost)
Sound Card
Onboard Realtek 5-1
Monitor(s) Displays
Samsung P2570HD
Screen Resolution
1920x1080
Hard Drives
Samsung 840 Pro 256GB SSD for OS, 500GB Seagate Constellation (Enterprise drive) for Data
PSU
Corsair HX650W
Case
Inwin Dragon Rider
Cooling
Hyper 212 EVO w/two Noctua fans, push-pull, @1300 RPM
Keyboard
E-Z Eyes, bright yellow keys with large characters
Mouse
steelseries SENSEI Laser Pro Gaming
Internet Speed
48-51Mbs Mbs down, 11 Mbs up Xfinity Cable
Antivirus
Norton Internet Security 2013
Browser
IE 10, Opera, Pale Moon if needed
Other Info
4 case fans, LG BluRay-RE, ASUS DVD-RW, Mr. Fusion power supply, 1.21 gigawatts.
VIA is set as the default defice, so audio is operative. The only thing I'm missing is stereo mix, since I am only able to see microphone and line-in.
 

My Computer My Computer

At a glance

Microsoft Windows 7 Ultimate 32-bit 7600 Mult...Intel(R) Core(TM) i3 CPU 550 @ 3.20GHz4,00 GBATI Radeon HD 5600 Series
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Asus desktop (not custom build)
OS
Microsoft Windows 7 Ultimate 32-bit 7600 Multiprocessor Free
CPU
Intel(R) Core(TM) i3 CPU 550 @ 3.20GHz
Motherboard
ASRock H55M-LE
Memory
4,00 GB
Graphics Card(s)
ATI Radeon HD 5600 Series
Sound Card
(1) ATI High Definition Audio Device (2) High Definition A
Screen Resolution
1366 x 768 x 32 bits (4294967296 colors) @ 60 Hz
Hard Drives
WDC WD15EARS-00MVWB0 ATA Device
Is there something like a VIA Audio Setting Manager in your Control Panel\All Control Panel Items?
 

My Computer My Computer

At a glance

Windows 7 Ultimate X64 SP1Intel i5-2550K, Differing ~4.4-4.8GHz No buil...16GB G.Skill Sniper 1866MHz @ 2133MHz 2x8GBASUS GTX650TIB-DC2OC-2GD5, (650TI Boost)
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Home Built Desktop By DataTech
OS
Windows 7 Ultimate X64 SP1
CPU
Intel i5-2550K, Differing ~4.4-4.8GHz No built in GPU
Motherboard
ASUS P8Z68-V PRO/GEN3
Memory
16GB G.Skill Sniper 1866MHz @ 2133MHz 2x8GB
Graphics Card(s)
ASUS GTX650TIB-DC2OC-2GD5, (650TI Boost)
Sound Card
Onboard Realtek 5-1
Monitor(s) Displays
Samsung P2570HD
Screen Resolution
1920x1080
Hard Drives
Samsung 840 Pro 256GB SSD for OS, 500GB Seagate Constellation (Enterprise drive) for Data
PSU
Corsair HX650W
Case
Inwin Dragon Rider
Cooling
Hyper 212 EVO w/two Noctua fans, push-pull, @1300 RPM
Keyboard
E-Z Eyes, bright yellow keys with large characters
Mouse
steelseries SENSEI Laser Pro Gaming
Internet Speed
48-51Mbs Mbs down, 11 Mbs up Xfinity Cable
Antivirus
Norton Internet Security 2013
Browser
IE 10, Opera, Pale Moon if needed
Other Info
4 case fans, LG BluRay-RE, ASUS DVD-RW, Mr. Fusion power supply, 1.21 gigawatts.

My Computer My Computer

At a glance

Windows 10x64 Build 1709Intel i7 7700HQ Kaby Lake16 GB DDR4 @2400Nvidia Geforce GTX 1060
Computer type
Laptop
Computer Manufacturer/Model Number
MSI GE72VR Apache Pro-416
OS
Windows 10x64 Build 1709
CPU
Intel i7 7700HQ Kaby Lake
Motherboard
Micro-Star Intl. MS-179B (U3C1)
Memory
16 GB DDR4 @2400
Graphics Card(s)
Nvidia Geforce GTX 1060
Screen Resolution
1920x1080 120Hz
Hard Drives
256 GB Nvme M.2 SSD

1TB HDD@7200
Cooling
Cooler Blast 4
Keyboard
Steel Series
Antivirus
Bit Defender Free
Browser
Edge
Is there something like a VIA Audio Setting Manager in your Control Panel\All Control Panel Items?

Under uninstall programs it has VIA platform manager.
 

My Computer My Computer

At a glance

Microsoft Windows 7 Ultimate 32-bit 7600 Mult...Intel(R) Core(TM) i3 CPU 550 @ 3.20GHz4,00 GBATI Radeon HD 5600 Series
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Asus desktop (not custom build)
OS
Microsoft Windows 7 Ultimate 32-bit 7600 Multiprocessor Free
CPU
Intel(R) Core(TM) i3 CPU 550 @ 3.20GHz
Motherboard
ASRock H55M-LE
Memory
4,00 GB
Graphics Card(s)
ATI Radeon HD 5600 Series
Sound Card
(1) ATI High Definition Audio Device (2) High Definition A
Screen Resolution
1366 x 768 x 32 bits (4294967296 colors) @ 60 Hz
Hard Drives
WDC WD15EARS-00MVWB0 ATA Device
I was thinking if some CDs came with this computer and I remembered some did and I found Intel-Intel Series IIH55-14b DVD: User Manual: Drivers:Utilities from ASRock. Should I put it in?
 

My Computer My Computer

At a glance

Microsoft Windows 7 Ultimate 32-bit 7600 Mult...Intel(R) Core(TM) i3 CPU 550 @ 3.20GHz4,00 GBATI Radeon HD 5600 Series
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Asus desktop (not custom build)
OS
Microsoft Windows 7 Ultimate 32-bit 7600 Multiprocessor Free
CPU
Intel(R) Core(TM) i3 CPU 550 @ 3.20GHz
Motherboard
ASRock H55M-LE
Memory
4,00 GB
Graphics Card(s)
ATI Radeon HD 5600 Series
Sound Card
(1) ATI High Definition Audio Device (2) High Definition A
Screen Resolution
1366 x 768 x 32 bits (4294967296 colors) @ 60 Hz
Hard Drives
WDC WD15EARS-00MVWB0 ATA Device
You could try them, I don't think it will do any harm. So in Control panel the VIA platform manager doesn't show up?
 

My Computer My Computer

At a glance

Windows 7 Ultimate X64 SP1Intel i5-2550K, Differing ~4.4-4.8GHz No buil...16GB G.Skill Sniper 1866MHz @ 2133MHz 2x8GBASUS GTX650TIB-DC2OC-2GD5, (650TI Boost)
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Home Built Desktop By DataTech
OS
Windows 7 Ultimate X64 SP1
CPU
Intel i5-2550K, Differing ~4.4-4.8GHz No built in GPU
Motherboard
ASUS P8Z68-V PRO/GEN3
Memory
16GB G.Skill Sniper 1866MHz @ 2133MHz 2x8GB
Graphics Card(s)
ASUS GTX650TIB-DC2OC-2GD5, (650TI Boost)
Sound Card
Onboard Realtek 5-1
Monitor(s) Displays
Samsung P2570HD
Screen Resolution
1920x1080
Hard Drives
Samsung 840 Pro 256GB SSD for OS, 500GB Seagate Constellation (Enterprise drive) for Data
PSU
Corsair HX650W
Case
Inwin Dragon Rider
Cooling
Hyper 212 EVO w/two Noctua fans, push-pull, @1300 RPM
Keyboard
E-Z Eyes, bright yellow keys with large characters
Mouse
steelseries SENSEI Laser Pro Gaming
Internet Speed
48-51Mbs Mbs down, 11 Mbs up Xfinity Cable
Antivirus
Norton Internet Security 2013
Browser
IE 10, Opera, Pale Moon if needed
Other Info
4 case fans, LG BluRay-RE, ASUS DVD-RW, Mr. Fusion power supply, 1.21 gigawatts.
In device manager it is displayed as VIA High Definition Audio Device. Under uninstall programs it is listed as VIA Platform Manager. Under Hardware & Sound I can see VIA HD Audio Deck.
 

My Computer My Computer

At a glance

Microsoft Windows 7 Ultimate 32-bit 7600 Mult...Intel(R) Core(TM) i3 CPU 550 @ 3.20GHz4,00 GBATI Radeon HD 5600 Series
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Asus desktop (not custom build)
OS
Microsoft Windows 7 Ultimate 32-bit 7600 Multiprocessor Free
CPU
Intel(R) Core(TM) i3 CPU 550 @ 3.20GHz
Motherboard
ASRock H55M-LE
Memory
4,00 GB
Graphics Card(s)
ATI Radeon HD 5600 Series
Sound Card
(1) ATI High Definition Audio Device (2) High Definition A
Screen Resolution
1366 x 768 x 32 bits (4294967296 colors) @ 60 Hz
Hard Drives
WDC WD15EARS-00MVWB0 ATA Device
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