The easiest way, assuming that the source provides the correct output for you, is to take a hash of the completed file.  If the hashes match, you're good to go.  In this specific example, I know Microsoft publishes the MD5 or SHA-1 hash of their major ISOs.  (I believe most legitimate software vendors who provide ISO files have this readily available these days.)

EDIT: This information may not be readily available directly on the download page, but you can often find it if you look.  This is really the only 100% foolproof way to be absolutely sure you have what you're supposed to.

How can I tell if a downloaded ISO is complete?
What features make one plant able to withstand dry spells better than another with relatively similar structure? For instance, one of my Rudbeckias is wilting from drought at the moment, and an Oenothera next to it is not yet showing signs of dryness.

Or like jewelweed (Impatiens capensis), which wilts even while the soil is damp, in full sun, and ragweed (Ambrosia artemisiifolia), which will grow in very dry locations without being phased.

Is it caused by a faster transpiration rate in some plants than in others?
