@Rehab Mohamad
OK,
Go to Control Panel > Sound > Playback and check that the speakers are selected.
Click on the speaker icon and select Properties > General > Device usage and make sure that it says enabled.
To get to Control panel, type control panel in the search box on the left side of the Windows desktop taskbar and either click on Sounds or on the app to open Control Panel and then click on Sounds.
Ensure that the headphones are NOT plugged in if you try to test the speakers in the Sounds tab, next to the Recording tab in the program