videomach problem

i cut my clips out in czero but when im joining them in videomach using xvid codec (got frm csflicks.net . its the only one which lets u add the clips in veags 600) it gives me dirrrrrrrty blurred vids .. if i used uncompressed and then compresse the file in vegas i get a nice output but the size is 48MB for a 10 sec clip whereas videomach gives only a 2MB clip ...

i did it on my earlier comp and had no problem ??!!

plz help !!