funnix

Hello, I try to install camstudio on 2 PCs the first one is okay but the second one (same model etc..) doesn't have MPEG LAYER 3.... So I try to install every packages below : K-Lite_Codec_Pack_1330_Full and also this one : K-Lite_Codec_Pack_1330_Full -but nothing has changed...I didn't see the MPEG LAYER 3 I have on the first PC !!! Can anyone help me, it is quite urgent, I need it to create a professional video, in order to train/explain every-day-Work issues.