Due to my ISP being a complete rtard, I've been out since my last effect/affect post - but you CAN effect an affect. It's a slightly unwieldy piece of English, but it's acceptable. Common usage has affect as a verb and effect as a noun, but this isn't necessarily always the case.
If I do something and alter the outcome, I have had an effect - though I have affected the outcome.
But I can also effect something and create an effect (effect can be used as both a transitive verb and a noun) and if the effect I've effected is a behaviour I can effect an affect.
As I say, it's a bit unwieldy (and complex), but it's acceptable.
Nine times (or more) out of ten you can only affect something and have an effect, not effect something and cause an affect. It's a very specific piece of syntax that would have you effecting an affect, so if you use the words that way round, you're probably wrong.