Advent 5411 Yoostar webcam not working with Skype?

My Advent 5411 came with a built-in Youstar webcam. I cannot get it to work with Skype - any ideas? Used to work with Skype, but stopped suddenly. The camera does work otherwise, such as to take a profile picture for Facebook. I've tried Fn-F# various and none work. I've tried updating the driver, but receive a message telling me that I have the latest drivers already. Help????