My windows vista built in cam

Question

HI my name is Melody I have a Windows Vista laptop aspire model 4720z and i had to go get it fix cause it fell but i guess they erased alot of my programs cause i cant get my cam to work and my laptop didnt come with the cam cd the program was pre install its a crystal eye built in cam i cant find the program in my PC and i dont know how to reinstall it pls help