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Revert to Twenty Twelve theme with all plugins off and see if it helps.

krishna 1-2 day back in my site add other google ad sense account code i remove meny time but this code come. i think my site have Malware ??

Are you sure you had Google AdSense? It is unlikely that it will come up if you removed it. It is quite possible that you are injected with adware (not same as malware that I could not find in your site).

Revert to Twenty Twelve theme with all plugins off and see if it helps.

Did you do that? I asked you to do so only for further checking to see if the injection is coming from a plugin or your theme. Don’t worry, you will not lose anything because all your site contents are stored in your database and uploads folder. They will return in the same style as and when you put back your theme and plugins.