OK…I guess that means you use the built in audio of the laptop as your audio device.
Which mic are you using…is this also one built in to the laptop or do you have a USB mic or something?
In the first instance I would download and install ASIO4all and select this as your Cubase driver.
Then with Cubase still open, you should be able to open ASIO4all control panel from the windows system tray and hopefully what you see in there will tell us if this is going to work! Unfortunately it’s not always that simple getting this working with built in audio.
If you are likely to do a lot of recording consider purchasing an audio interface and a proper studio mic.