Lightroom 5 suddenly doesn't recognize my serial number.... Help?

I get this message when I try to open lightroom on my computer (I've had lightroom 5 installed on this computer for a full year, and not the cloud version):
"The serial number you entered is invalid. Please try again."
It won't ever work. It is the correct serial number.
Help is appreciated!

I was using the trial version, which recently ran out. Loved the software, so a couple of hours ago I purchased a standard license via download from Amazon.
Amazon sent me what appears to be a valid license key (6 groups of 4 digits). But Lightroom will not accept the key, with the exact same error message as you in your post.
I've sent Amazon an email message. Meanwhile, I have phoned Adobe Support...and I have been on hold for over an hour, without being able to speak to a live support agent. Your phone sucks, Adobe.
I wonder if something's gone wrong with their licensing/validation system.
Adobe?

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I have the latest version of lightroom 5. My copy is constantly asking me to enter my serial number. It does not ask me everytime I launch LR, but maybe every 5 to 8 times I open LR.
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I had a problem with that post. While it is pretty exhaustive, at first there was a major problem that baffled me. So if anyone is having trouble with the instructions here http://forums.adobe.com/thread/800907?tstart=0 , here is what happened to me and how I got past it.
My problem was that I had been told by Lightroom about 10 times to enter my serial number. I was so fed up on the tenth time, I immediately quit Lightroom and tried to search the internet for answers. I came across the post above but could not get it to work. Why? because the post/link above asks one to search, in a couple of different folders, for a file called "Lightroom 5.0 Registration.lrreg" (because I have version 5 of the software, your number may be different).
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When I realized that, I easily found the registration file which allowed me to follow the directions in the post/link above.
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I should have realized this earlier, but I was just so frustrated with re-entering my serial number, I decided I was going to solve the problem first before entering that dam long number AGAIN.
Thank you dj_paige for pointing out the article and leading me back to it.

Lightroom 5 suddenly doesn't recognize my serial number.... Help?

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