First you should check your volume settings.

Next, make sure that you select the same 'playback' device in Windows and Paltalk.

If you still have no sound, you may need to adjust the 'bit rate' or 'sample rate' settings in order to hear sound.
Paltalk uses 16 or 24 bit sound, at a sample rate or 48 Khz (kilohertz).

To check or adjust your bit rate settings do this...  Right click on the speaker icon (usually at the lower right of your screen)

Now select 'open sound settings' from the popup menuG.

On the right side of the screen select 'sound control panel'.

When the sound control panel opens, click on the 'playback' tab at the top of the window.

Click on your 'speakers / headphones' selection and then click on the 'set as default' selection.  If you pick a different default playback device, be sure to select it under the 'speakers' menu within Paltalk's Video & Audio settings.

Now click the 'properties' button.

When your chosen default playback device's  'properties' window opens, click on the 'advanced' tab at the top of the window.

Be sure that '2 channel, 16 bit, 48000 Hz, DVD quality' is selected on the sample rate pull down menu.  You can also use '2 channel, 24 bit, 48000 HZ, Studio Quality.

Note:  You should choose the same bit rate settings for the playback and recording device you use with Paltalk

Click the 'apply' button.

Now start up Paltalk and open the settings window by clicking on the little 'sliders' icon above the pal list area (where your online pals are listed)

Click on 'video and audio' on the left side of the settings window.

Use the 'speaker' drop down menu to select your playback device.  This is usually the 'default' playback device that you had set previously in the sound control panel.

Now try joining some rooms.  You should be able to hear people speaking or playing music.

If not, check your Windows volume mixer.  Left click on the speaker icon at the lower right of your screen.

Now use the volume slider to increase the volume.  Try sliding it the whole way to the right.  You should hear sound or music in the room now. Try hopping around to different rooms to verify it's working now.

If you still have no sound, right click on the speaker icon, and select 'open volume mixer'.

Use the 'Paltalk settings' slider to adjust the volume for Paltalk.

If you still don't have sound, double  and triple check your connections.  Make sure everything is plugged in, turned on, and any volume controls are turned up.

If all else fails, your cat may have chewed your cables (don't laugh it happens).  Examine your cords and cables to see if you see little pinhole tooth marks....  (BAD kitty!)