I now realise why hardly anyone uses Open Source software: it sucks!
I installed TortoiseSVN right clicked the desktop and tried to create a repository. I have done this with a previous release of TortoiseSVN, so I know what I was trying to do.
One would have thought that the creators of this allegedly good version control system would have at least tested it enough to know of this mis-feature.
Right now I am still searching for an answer, but Google is useless when it comes to obscure software.
If anyone finds out, please let me know in the comments.