I had this same problem and managed to fix it. Just like your example above, I had
DocumentRoot C:/vhosts/betaglucanreviews
without the inverted commas around the document root directory.
I don't know why but after I changed it to:
DocumentRoot "C:/vhosts/betaglucanreviews"
as in the example Vhosts, it worked!
Hope that helps,
Good luck.
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