Hei I hawe problem widh my web cam in yahoo

Question

Hei! I hawe a laptop a new one too widh a web cam in its a HP laptop a big one its a hp pavilion dv 95000 and i use vista i use my cam than i come home after i bye it but only after 2 mounds i gat problem to open my web cam and now i cant at all but in windows messsenger its ok why??