'Risk' to me implies a danger that is not certain that will occur but it might, so in Greek terms it could be translated as:
risk = pithanos kindynos
On the other hand, 'potential hazard' is more of a statement that something should occur, so I translated this as:
potential hazard = endexomenos kindynos.
Now in plural both the above are translated as:
'pithanoi kai endexomenoi kindynoi'

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Note added at 2002-07-08 09:10:13 (GMT)
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I have to add, that both risk and potential hazard apply in the case that a user of some product (what ever that may be) does not follow the use instructions correctly.

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Note added at 2002-07-08 09:15:03 (GMT)
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Finally, if you don\'t follow the instructions you may risk something (pithanos kindynos) but it is more probable that you\'ll hurt something / someone (endexomenos kindynos)

I hope that clears my explanation :)