Just click on Start, then Run. Then type "regedit". (You may have to say yes to making changes to your computer).
This will open up something that looks similar to Explorer. For me it wasn't HKCU (Geod may have been abbreviating). One of the 5 main folders on the left side should be "HKEY_CURRENT_USER". Click on that, then click on "SOFTWARE", then "Geod Studio", and finally "3DNes".
You can just delete the "3DNes" folder, or delete all of the files that show up on the right window. (I had 7 of them).