CS3 says "trial period has ended" and demands license key - I own the product! but can't find the key

I bought CS3 a couple of years back, and have been using it without problems ever since. All of a sudden I try to open it today and it says "Trial period has ended, please enter license key". The trouble is, I have no idea what the key is, when I bought the software I did it online with a work email address and I no longer work for that company so there is no way of tracing the email from my end.
has anyone experienced this? Any help gratefully received, I really need to do some work! and I don't really want to pay for PS all over again.
Many thanks.

I registered my CS4 with Adobe in August 09 and have been using it ever since. Until today when trying to open InDesign I get a window that says Software Setup wants my registration code. It says I have two options - Use this on a trial basis, or enter registration code, which I did and it says it's invalid.
I downloaded the tool you mentioned, but it wouldn't run saying it was missing a .dll file.....
I didn't buy from Adobe, but if it was pirated wouldn't they have been able to tell when I registered it?
I started a case with Adobe support, but from what I'm reading I don't expect much!
Any Ideas?

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