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codec problem occurs if there is any sound problem i guess sound drivers r not insalled in your collegu's comp. if it is installe change the format to mp4 and send it. you can dowloa totalconverter from net and do the converstion.
it it is p4 board then u need to format and reinstal ur os. immediately after insalling os intall sound drivers dont install anything else. after ur sound drives are installed then install other softwares...