When i record an AVI file with Action! sony vegas brings up this error when i try to import it saying it does not support the codec. Can anyone tell me how to fix this or how to install the correct codec?

Hello, So, i have a problem with .avi.files. I record my desktop or any game and the .avi file is created but i can't reproduce it with any software... the only way i can reproduce the .avi file is whit the Action! Software. mp4 files work fine but arnt as good of quality. Anyone know how to fix thi...