Restore the programs on the website (not the database if it uses one) from a recent backup or from your local copy, or even from your test environment. If you don't have anything like that (why not?), then check all files and remove the ones you didn't put there yourself, or that were modified later.
Contact the hosting provider about their protection policies, like do they scan your site or how to scan it yourself. If you feel this is not adequate, find a better hoster.
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Link to infected web site removed by moderator.