struggling with extraction

without seeming to gormless i need to ask a question................. i am not technically minded and i am having difficulty at moment extracting the films i download ........ i was used to the parr,s doing the work for me by opening it up and checking and repairing if needed BUT the films that are downloading at moment are just like white file type boxes that i dont know how to extract ...... i have always used grabbit but because of lack of parrs i am struggling ....it is probably a lack of technical knowledge due to my age or something...... and i am probably overlooking something but try as i may it has me baffled ......can anybody shed some light on what i am doing wrong ..... or why there are no parrs THANKS in advance and i will read your answers tommorrow after work............. cheers jimmyblackcab