You can get the "Forbidden" error if your user account lacks access permissions to a repository or repository path; it makes sense to check authorization settings for your user account. Make sure your system administrator hasn't provided you with No Access permission to the repository path.
If you are sure that permissions are set correctly, then double-check the URL you use. URLs in Apache Subversion are case-sensitive.
Additionally, I advise you to read articles on authorization in Subversion and VisualSVN Server: