ac3 machine

Having small problem with converting mp2 to ac3 have D/L ac3 machine and besweet v1.5b21 and set it up as per chickenmans divx 2 dvd-r tut but when i click 'give me my ac3' nothing happens haven't a clue what im doin wrong .... any help please?
 
Make sure in the top line of AC3 Machine, that it actually points to the folder yoiu have BeSweet installed in, otherwise it cant do a thing.
 
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