The Record Zofilia How Do I Record Sound Playing From My Computer With Headphones In The Slot?

How do I record sound playing from my computer with headphones in the slot? - the record zofilia

I need some audio off i video record on my computer and tried to be without my helmet and all the noise around my house, so I want to do with a helmet, only problem when I write, it sounds very low even if I have the highest level with the inclusion of instant messaging, I need very good quality! Can someone help me:)?