If you still have the old install you should be able to find your key file in C:\Documents and Settings\UserName\Application Data\Planetside Software\Terragen 2 where C: is your Windows install drive and UserName is your Windows user name. You will need to have "Show Hidden Files" on and "Protect Operating System Files" off in Explorer folder view options (Tools->Folder Options). When you find the keyfile (tg2key.tgk) simply copy it to a USB drive, CD, or floppy, or over the network to your new machine, then put it in the TG2 install folder and it should automatically be recognized.
If you are still having trouble the best way to get help with your license key is to email
registrations@planetside.co.uk directly. Keep in mind it is the weekend and most of the staff isn't on the clock. I do part-time flexible hours so I'm here on weekends more often. As a result I am likely to be the most responsive, especially on the off hours like this. If a PM such as your recent one is simply asking for a response to a forum post I will respond directly to the thread rather than to your PM. I hope you don't misconstrue that as not being responsive to your message.
- Oshyan