NoLimits Editor won't Run - Help please?

So I'm playing RCT3 on my computer, right? And it's like 1 in the morning, so I want to go to bed, and I quit RCT and put my computer to sleep, and when I wake up in the morning and try to open a NoLimits track, it won't work. So, I shut NL down, then reopen it, hoping that will work. After several unsuccessful attempts, I give up and restart my entire computer. That didn't work either, and after a few more tries at that, I give up and try to wait it out. Keep in mind that this was like a week ago. Now, I'm finally getting around to asking other people about this, and I really need some help.
If you need the info, I'm running an out-of-the-box HP PC with XP, and a recent 512 MB graphics card update, along with a total of 2 GB RAM, and I know that the graphics card and RAM aren't the problem; they've been in there for months. The ONLY thing (that I can think of) that was different about the day it died was that I had recently been playing RCT3, which I hadn't touched in months before. Could this potentially be the issue? Thanks in advance for any help!

The easiest thing would be to re-install your nolimits, make sure you have note of your NL key (ask if you dont know how to find it), then copy the Tracks/Enviroments/Objects/car textures/etc.. into a temporary location, uninstall, install, copy the folders back

Thanks for the help, I'll try that, but....uh....how do I get that code? I registered my version of NL with a different email address than I have now, and access to the old one (I think) is nonexistent anymore. What else can I do to get the reg key?

[Oscar]

Check in your registry before deleting, the code is there along with the username.