Crystal Report Problem Helpppp Me :-)))

hi there i wrote a C# Application in my pro i have some reports by Cr in my PC every thing work fine and i can see all the reports but when i am traying to see the reports in antother pc its not working an i get exsptions Crystal decion are not found something like that maybe i need a jet engin ? there is someone can help me ? why i cant run the reports in antoher computers ? i am working whit VS 2003 and the Crystal reports is bullit in . lang C#