Ah ... stay away from copyright files & you won't have that problem.

There's some tips here Recognising fake files

Use Bitzi to ensure the file is ok. And try downlding from just a few sources under the # column of search results. ALso modem users can be trusted here to downld from.

BTW if you speak french, then there's also a French language section of the forums. The moderator there is much more knowledgable than me.