internal microphone doesn't work - VN571G 752H

I cant get my new laptop to properly configure my internal microphone. Whenever I try to set the level of recording there seem's to be not enouth volume beeing recorded. I recognize that the microphone is somewhat working and physically intact, since there is reactions to tapping on the case or the keyboard. But my voice is not beeing recorded.

I just updated my realtech drivers, but it didn't change anything. Is there any setting that is messed up or I might be missing?

I would appreciate any help!

Sebastian