Well, I found this forum yesterday and I've to say that it's one of the best Windows forum I've ever seen. Lucky to be here. Anyway, coming straight to the point, I recently downloaded a Windows 7 Ultimate SP1 ISO MSDN (before coming to this forum) via Bit-torrent. I want to check if it's a genuine one or modified. ========================= File name - en_windows_7_ultimate_with_sp1_x86_dvd_619077.iso Size - 2.38 GB ========================= But, I don't know how to calculate the HASH of that ISO. How to do it? Also, what is the HASH of the Orignal MSDN ISO? Have a nice day. Thanks!