I think I have one here.
Win 7 SP1 64bit, from the DVD. not torrent with "Additives"...
No offense, but
http://en.wikipedia.org/wiki/Cryptographic_hash_functionn << basically, if you have a hash from MS, and it matches the hash generated from a file you downloaded (no matter the source, torrent, FTP, or ripped off of a scratched writable disc that you found in the trash), then it is 100% genuinely bit for bit the same as a shining golden disc straight from the hands of Bill Gates himself.
Of course, there is always a chance that the files will not match (in which {rare in my experience} case you can just try elsewhere), if the uploader is not reputable (else he would not have claimed that the ISO was untouched) -- it's usually easy to avoid wasting your time with bad downloads if you examine the uploader reputation and the comments section. (Of course, always verify the hash after downloading anyways.)
People tend to treat torrents as if they are cesspools of viruses that will attack you if you even think of them. You just have to use a bit of caution and common sense is all.

EDIT: Oh, and that's not to discredit what you did, that was nice.
