Vista - downloads die on vista

I have noticed two situations where Vista seems to give up on a download
that worked fine on XP. One is with Flash objects, such as the crossword
puzzle website

http://games.latimes.com/index_cross...ure_code=tmcal

The puzzle on this website malfunctioned from being incompletely downloaded
about three days every week, not always the same days of the week. Then I
discovered that I can get it to work correctly every day by making sure that
I am not downloading anything else in any other IE windows when I navigate
to this website.

The other situation is with images; the download usually dies before
completing on TV weather websites for radar images (the single-image kind,
not the animated ones), like on

http://www.keyetv.com/weather/default.aspx

The properties display shows that the image is a jpeg. This malfunction
occurs on the websites of three different TV stations, and the download
sometimes dies even if it is the only IE window doing a download -- perhaps
because these pages download so many objects that it interferes with itself
somehow?

What might be causing downloads to die incomplete? The solution I
discovered to the crossword puzzle website indicates that the problem is
with Vista, not with the website.

Thanks,
Jeff