Post your URL and details on the Google forum - http://www.google.co.uk/support/forum/p/Webmasters/ask - being as detailed as you can.
You'll then get an assortment of wiseguys telling you your site is a thin and crap affiliate site and to accept that. Ignore these and look out for the few people who provide useful suggestions. These usually range from noindexing pages and nofollowing links to more complex solutions.
Leave it for a few weeks to see if its a blip then start to try out the suggestions. It may be a few simple changes can sort this out.
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