That wasn't much help, unfortunately.
Have you tried running svnserve directly, with the same options but
without the -service, from the command line?
--
Life is complex, with real and imaginary parts.
"Ok, it boots. Which means it must be bug-free and perfect. " -- Linus Torvalds
"People disagree with me. I just ignore them." -- Linus Torvalds
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Does the service user have access to the 'C:\svn_repository' directory? Give that user Full Control of the folder and try starting the service.
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