i played a movie using the divx and i had no sound. it informed me that i don't have tag 8149 and in the wmp i got error message C00D10D1. now, i have Gspot but it doesn't tell me which codec is missing and i have ac3 filter and ac3 decoder but i still have no sound. i'm not very good with computers so maby i had to do something with the ac3 fillter that i didn't. what should i do now?