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Hi, I wouldn't worry too much about them, but you can mark them as nofollow and exclude them via the robots.txt ... as they are on so many pages throughout the web, I'd assume Google & Co do kind of ignore them when putting weight on different links ...

Poor conversion can be cause by many things... - unprofessional copy - high prices - high shipping - bad checkout procedure - out-of-date merchandise - difficult to navigate site - great offers by your competitors - low quality traffic Consider the above and compare your site, your offer, your prices and your conversion funnel to what your competitors are doing. There is a lot more to making a sale than getting good ranks.