Hi
When I start a call to a friend in Skype, I can see their video clearly but they can't see me. They can hear me and my mic is built into my webcam so sound works fine. Please help me as this is very frustrating.

Can you see yourself in the mini view where you see your friend? If not, do you see a blank square or nothing at all.
Make sure you have it set up to automatically send your video, or press "send video". If it all works fine from your end, make sure you and your friend both have the latest versions of skype.