Audio driver not working in windows 10, 64bit

I did something crazy. While installing or removing some junk (softwares) from my pc and then suddenly i noticed that red cross sign appeared on my volume icon and no sound was there. when i checked the device manager following drivers had a small yellow triangular mark beneath them and audio was not working.

1, Microsoft Streaming Clock Proxy,
2, Microsoft Streaming Quality Manager Proxy,
3, Microsoft Streaming Service Proxy,
4, Microsoft Streaming Tee/Sink-to-Sink Converter,
5, Microsoft Streaming Tee/Sink-to-Sink Converter, (no that's not a misprint, That one was listed twice)
6, Microsoft Trusted Audio Drivers.
7, NVIDIA High Definition Audio.
8, Realtek High Definition Audio.

I tried rebooting pc many times and re installing realtek audio driver but no benefit.

I am using windows 10 and my hardware is Dell optiplex 7010, Corei7 3.3Ghz, 8gb Ram, 500 gb Hard drive , 2gb Nvidia Geforce 210 Graphics card.

Thank you ever so much for sharing any knowledge you have about this to fix my pretty dumb mistake.

Start by reinstalling the Intel Motherboard Chipset drivers, then the other chipset drivers listed on the Dell downloads.
Reboot the PC after the chipsets are installed. Check the Device Manager to see what if any is still listed as an error.
If the sound is still listed, you can download the Realtek drivers from the Dell downloads. NVIDIA is for HDMI audio and installed with the NVIDIA video drivers. If you are not using HDMI audio you don't need it.

Here is the link to the Dell downloads for your model.
Support for OptiPlex 7010 | Drivers & downloads | Dell US