I had a problem with my computer, and it needed to be resest completely, so I saved some files on a disk (NL being one of them) After the computer was wiped I re-installed the disk and now when ever I try to open one of my tracks it says I do not have the registered version and cannot view the track. There are no files missing and I am wondering if anyone has an idea that can help, other then re-buying NL.
I did this also. You really need to hold on to that reg-key and username you initially use. Save it as a word document or something in your NL folder or something so it's easily accessible. You can contact the NL team and they'll give you a DL and a working reg-key if you give them your e-mail, address, zip code, all of the junk you gave them to buy the game. They'll make sure you're actually you, and then help you out.
Just do the above. E-mail info@nolimitscoaster.com and explain the situation with the stuff you entered when you bought it. They only do it 3 times though...I believe a guy named Joerg will help you out but it's been awhile since I reformatted...