Yesterday I downloaded 2 videos which I converted to the Real Video format. I left the coverter running while I went for my tea. ON my return there were three versions of the converted files (in addition to the original) - all different file sizes.  Two of the conversions were only about 1/3 the length of the original. This has happened before but  If I am near my PC when  a conversion finishes it doesn't happen - I just get the pop up box asking me if I want to delete the original.  SO what is going wrong.