How to put convertxtodvd on new laptop

I have a desktop with windows xp and have bought a laptop with vista.
My question is can i copy convertxtodvd which i bought and is working fine on desktop over to laptop .when i try to download and put in the activation key number they emailed to me it says it’s out of date and i need to buy again. is this right or is there anyway i can do it without having to pay again.

Unfortunately you will have to buy a new key.

But you can download DVDflick which is free and it does the same thing convertxtodvd does. It just has a few more steps but it is free and does work with XP or Vista.