72C is not so bad for a GPU, plenty of them can run up to 90C stock, though seeing temps like that would definitely have me sweating. 75-80 wasn't too uncommon for my old 8800, on full load. Doubt any number of case fans can make up for a GPU-fan that has died, not for a card that is not designed to be passively cooled at any rate.
As for the BSODs, best guess is that the HD is on its way out, but it's really impossible to tell without any decent info.
Get a gaming case. I started off with a cramped case as well, since moved on to something decent. Knocked quite a bit off of temps all around.
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