It's normal for you not to see your own server in the serverlist in game when running it on the same computer.
If he types
connect 127.0.0.1

Into the console it should connect him to his server.

@Xerxes is that correct?

@SpazmicParadox I don't think there's a difference so i'll be interested to see.

@SpazmicParadox Sounds good - make sure to place piry.exe somewhere such as C:\Games

@SpazmicParadox I'm not sure I follow?
What do you mean by "it"?

Is he running the server from the same PC he is playing on?

https://www.dell.com/support/contents/uk/en/ukbsdt1/article/product-support/self-support-knowledgebase/software-and-downloads/supportassist

Dell SupportAssist is likely the easiest way to do some driver updates. If you let it install and scan your machine, it should then offer you any driver updates, probably worth installing them all, especially if there is a sound driver update. (screenshot the window after all the updates are done please)

Just incase this doesn't work, can you also open the start menu and type winver and screenshot the window that opens, thanks.

Cheers, so your device is set as the default device across everything so that's good. It makes me think it might be a sound driver problem, would you mind downloading this: https://www.ccleaner.com/speccy/download/standard and run it by opening the start menu and typing Speccy? Can you then screenshot the window that opens? Please wait until it finishes analyzing. It will look something like this:

Go to start and type Change System Sounds and click the item that appears.

Then click the playback tab and screenshot that window please.

Can you atleast post a screenshot where the game doesn't cover the important information in the other window?

Do you have a headset? If so, ensure it is set as your default audio device in your Windows audio settings. Also double check the audio output device in the game settings is set to the device that you'd like sound to come out of. (Ideally the same device you have as your default audio device in windows)