Windows 7 No longer detects speakers

I have problem called "no speakers or headphones are plugged in"
While my speakers are plugged in.
Here's how It happend:
1. I decided to cleanup my PC but I decided to upgrade to Windows 8.1. I noticed that the sound icon on the taskbar says "no speakers or headphones are plugged in", nor the troubleshooter detects problem. I've tried to see the devices (speakers)
in the sound settings:
NVIDIA HDMI Output (Port 0) (NVIDIA High Definition Audio) - Not plugged in
NVIDIA HDMI Output (Port 1) (NVIDIA High Definition Audio) - Not plugged in
I don't even have HDMI cables, my speakers are using lime-green thing and usb cable. I don't know is it the usb cable or the lime-green thing, but after all nothing.
2. I downgraded back to Windows 7 still no sound. What should have happened I can't fix this!
I only installed Virtual Audio Cable for now this wont fix the problem, I know. Does anyone know what to do?
3. I tried reinstalling the sound driver from device manager (Unintalling HDAD (High Definition Audio Device) doesnt help neither)
I currently have 3 (+ VAC/Virtual Audio Cable) sound drivers:
High Definition Audio Cable
NVIDIA High Definition Audio
NVIDIA Virtual Audio Device (Wave Extensible) (WDM)
Processor: AMD Athlon(tm) 64 Processor 3500+ (32bit/x86)
USB Cables:
Standard Enhanced PCI to USB Host Controller
Standard OpenHCD USB Host Controller
Unknown Device (can't be speakers, i tried unplugging them still there)
USB Root Hub
USB Root Hub
I really need help!

Hi,
I agree with Rick, first please make sure that the hardware component, the built-in audio device is not corrupted, as a test, you can replace a external\usb headphone\speaker to test the audio function.
Install latest drivers for audio device no matter you're using Windows 7 or Windows 8.1, check the driver in manufacture website as mentioned in the first reply
Meanwhile, runt the Fixit and check if it is helpful
Hardware devices are not working or are not detected in Windows
http://support2.microsoft.com/mats/hardware_device_problems
Tips for fixing common sound problems
http://windows.microsoft.com/en-us/windows/tips-fixing-common-sound-problems#tips-fixing-common-sound-problems=windows-7
Yolanda Zhu
TechNet Community Support

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