First, reboot your PC (if you have not tried this already) and see if it then works.
If it still does not work, then download the file thmcrypt.exe in the link that I will PM to you directly after this post. Just save it to your desktop. Then run this file from the command prompt by selecting the windows start button, then select run, then type cmd and press enter (this way you will see any errors that may occur). Once you are at the command prompt, you just type thmcrypt and press enter. If no errors, start eCabSys and see if you get it to work. If you get errors when running this file, then you will need to delete the {RSA} folder located in the following directory (it looks like you are running XP, so it will be here): C:\documents and settings\{your user name}\application data\microsoft\crypto\ Just delete the entire RSA folder, then rerun the thmcrypt.exe then try to create the twd again.