Well I\'ve gotten myself in a pickle
I did the subversion 1 click setup and it worked great. However, in setting up my repository I accidentally committed a file th
It would appear that the 'one click setup' is based on an ancient version of SVN, but somehow you've also got a more up-to-date version of svnadmin which has created a newer repository.
I can't help you with your failed install/uninstall, but when you finally get rid of all the detritus of the 1-click install, then I'd try again, using something more up-to-date.
Here is a more up-to-date version in a nice package:
http://www.collab.net/downloads/subversion/
And here is the same stuff in just a .ZIP file which contains all the bits you need:
http://subversion.tigris.org/servlets/ProjectDocumentList?folderID=91