Hi Patrick,
1. Please help to launch YouCam and click "Configure the Cyberlink YouCam settings".
Check the path of "Capture folder".
Is it "c:\Users\(your account name)\Documents\Youcam" ?
If you've changed this path, please try to enter "c:\Users\(your account name)\Documents\Youcam" and check if your video are in this folder.
2. Do you remember any name of video that you recorded?
If yes, maybe you could try to search it in your computer. (Press "Win" + "F" to search)
If no, and you never changed the name of video, please help to search this key word: capture_20
Thanks