Go to
-Control panel
-System
-Device manager (Which will be in the top left hand corner)
-Click continue
-Go to Sound, Video and Game controllers
-Now look for disabled devices.
If you headset is disabled...
-Right click
-Select enable
If that doesnt work/
-Right click your volume control (in the taskbar, the white one)
-Click on Recording Devices
-Then check that the microphone is your default recording device
If that doesnt work well go get a job to earn some money and buy a proper headset