Enabled sound threw tv, now computer speakers wont work

Hello, this is my first post
I was trying to watch a video on youtube one night, and the sound was not loud enough, so I changed my audio device from my pc speakers to my tv, I use for a monitor. Now I cannot enable sound on my pc speakers, in fact they are nowhere to be found in my audio devices....all I can think is, what the....? In my task bar the soundmax icon has a red circle with a slash through it, and says (no soundmax audio device...you cannot use soundmax audio settings). I try to open soundmax, and it will not open. I don't know what to think about this, all I did was change audio devices, which I have done several times with no issue. I know my pc is old, but this is probably gonna be my last straw! I am so sick and tired of all the windows glitches, and errors, I am about to jump into a Mac faster then you can say "windows sucks"
So, can anyone help with this latest of many errors I am experiencing?

I just changed it through the hardware and sound, and manage audio devices. After it was changed, my pc speaker icon totally disappeared.

Hi try re installing the drivers for sound.