Yes, you can use the WebCam through QuickPlay, and yes, it works under Vista.
To access QuickPlay, just press the "blue QuickPlay button" next to the power button. If it doesn't load QuickPlay, just do "Start" - "All Programs" - then you will see QuickPlay listed there. If you still can't find it just do a search, you will find the short-cut.
Once launched QuickPlay, click on the 2nd icon from left (between DVD and TV icon), then double-click on "HP Pavilion WebCam" from the left side panel, then you will see the blue LED light lit and you should see yourself on the screen. (Double-click "yourself" to enlarge image)
To take a picture or record video, just press the corresponding buttons on the top. (the red circle icon is for recording video (press "Stop" icon to stop recording), the camera icon is for, well, camera)
Videos and pictures are saved at:
Pictures -- C:\Users\Public\Pictures\My Snapshots
Videos -- C:\Users\Public\Videos\HP Webcam
Have Fun!
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