Will greenpois0n work with the ios firmware 4.3.3?

i have tried redsn0w with my new laptop in runs on windows 7 and for some reason when i run redsn0w and open up my files to get he ispw firmware 4.3.3 it says that there is no content from the folder. i dowloaded the firmware from osxdaily and felix bruns and neither work should i be downloading from a different site or what please help