настроить поиск на сайте

Ничего не работает. Но видео и больше не включается. Уже хорошо.

почему могли возникнуть эти видео

А где вы взяли тему для своего сайта? И какие плагины установлены?

Не сразу. После нескольких переходов по вашим товарам. Закономерности появления видео я не успел заметить

да никуда они не делись.
вон в исходном коде видно:

<div class="page-description"><p>&nbsp;</p>
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отключите все плагины и напишите сюда.
я проверю исходный код.

все равно есть.
и что интересно — там чуть выше вредоносного кода див revolutionslider, хотя в списке установленных плагинов я его у вас не вижу.

он встроен в тему? тему точно купили, а не скачали на помойке?