The Acer Aspire C22 supports Bluetooth, so you can theoretically connect external speakers that way. However my own experience is that there can be some 'lag' with Bluetooth connections, meaning that (say) the audio might be very slightly out of sync with the picture when watching a YouTube video. My own instinct would be to make use of the 3.5mm speaker socket to connect a pair of amplified speakers. e.g.
https://www.currys.co.uk/products/logitech-z150-multimedia-2.0-pc-speakers-21775705.html
(Note: When choosing speakers, some need to be powered via a USB socket whereas others come with a mains adapter. Take care to choose the best for your needs).
You might well be able to use a TV sound bar with your computer but it would depend upon the type of inputs available on the soundbar.
It might be worth uninstalling, and then reinstalling, your computer's sound driver first though:
Start typing 'device manager' in the search bar.
When 'Device Manager' appears under 'Best Match', click on it.
Double-click 'Sound, video & game controllers'
Right-click on the name of your sound driver.
Click on 'Uninstall device'
If asked to confirm your decision, do so.
Then close the Device Manager and restart your computer. (The sound driver will automatically reinstall itself).