How to decrypt acer web camera on laptop

Hello,

my laptop is a acer windows vista and the camera icon appears on my desktop but when i click on it, it wont open... it says "Camera not found" how do i fix this? there's also a message that appears when i click acer Crystal eye webcam it says the file has been encrypted, it needs a password to decryption.. how do i know what the password is.. please help!! thanks