I used to use the cs4 before, but I couldn't activate them recently! Why??

I need the cs4 to finish my homework, but I couldn't use them recently, when I click anyone of them, it opens up a window and says the authorization of using the product has gone and error 3!!!
I don't understand what is happening, I bought the product, it should be lifelong, isn't it?

It should be (more or less). So, a few questions;
Can you give us the exact wording of the error that pops up?
What system and OS?
When was the last time you used it?
Has anything on your system changed since then?
Perhaps most important; When did you buy it, and from where?
--OB

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