Well I registered my RMXP about 2 years ago, and I used it and it was all good. Then I got a new computer (Windows 7), and I installed RMXP and got it to work, but obviously when I started it up it was unregistered.
I tried my old code to try and reregister it, and it said it didn't work. I was wondering how many products are you allowed to register? If it is more than one, is there a reason it might not be working on my new computer?
You can only register 1, but you have to remove it from your old computer to install it a second time I think.
So you DID buy it? Well shit, use a keygen. It's perfectly fine to use one to reactivate a product you've already bought if you run into complications(At least, I think so.). ;)
Just contact enterbrain. As long as they still exist, they should easily be able to help you.
(Illegal) Copy the Psikey.dll from your registered RMXP and paste it on the new one.