Hi there
Dont think I understand what the problem is.
Cpro dont require you to register to download it, just if you want to post in the
[link] you'll need to register.
As for the plugin braking Winamp... Your instalation probably got broken.
Best suggestion would be to go to your:
%appdata%/Winamp directory and deleting "studio.xnf" (just close winamp before you do and wait 10secs)
If the above still dont solve your problem maybe delete Winamp.ini in the same folder too.
Also make sure you have the latest version of cpro and winamp.
Hope your problems are solved now