Help with file crasher

ok so my friends and i filmed a spanish video due a few days ago and we didnt edit it yet. my friend told the teacher it was done and we still havent gotten a chance to edit it. I remember a thread on a here a while ago about some file crasher thing that i can download and put on my flash drive and it will come up with some error and wont open, i really need this. if any one can help me at all i will be so thankful +K fa sho. need your help ns