Sounds as if the camera driver went south. Go into device manager and see if there is an error issue shown on the camera driver, yellow question mark or asterisk. If there is an error shown, try to re install and/or update from that location.
i am using Toshiba Satellite L310. I'm using vista ultimate home edition. I tried starting my webcam it said '' webcam driver open failed. you need restart your camera or computer''. i tried restart my computer and my camera so many times and i installed and reinstall so many taimes too but, nothing solved. does anyone know how solved this problem?? thanks