Yiqilai is pesky adware + malicious browser toolbar combination. Yiqilai is presented as online search toolbar but it comes with hidden agenda. It collects information of every search request and it later delivers customized advertisements based on collected data.

Yiqilai adware is not a real danger to user’s privacy or security. However, it slows down a computer. And it makes it difficult to browse the web by loading constant and annoying pop-ups.

Source: http://www.spywarevoid.com/remove-yiqilai-adware-remove-yiqilai-pop-ups.html