Can you try this in mysql monitor:
SELECT SUM(Review_Rating) AS total, kb_Links.* FROM kb_Links,kb_Reviews WHERE kb_Reviews.Review_LinkID = kb_Links.ID GROUP BY Review_LinkID ORDER BY total DESC LIMIT 10
SELECT SUM(Review_Rating) AS total, kb_Links.* FROM kb_Links,kb_Reviews WHERE kb_Reviews.Review_LinkID = kb_Links.ID GROUP BY Review_LinkID ORDER BY total DESC LIMIT 10