Does anyone know or use any free video format converters? I need one

to convert video clips to .wmv or MPEG format for a project because .avi files

are visually incompatible with windows movie maker (there's audio,but no video),

and don't really want to pay some unknown company an unreasonable amount

of money for a full version (I tried using the trials, but they're completely

useless).

Can anyone help? Thanks