Where is the virus on the site or on the client?

Question

Malware

Help to understand the problem, made a website for the client. opencart engine. At the client, when trying to access the site, the antivirus issues a warning. Screenshot https://www.dropbox.com/s/hs4opnsejcggpbj/screen.J... I
checked on other computers, it's Kaspersky, there is no message.
And at the client - appears.
What's the matter? Virus on the site? Or something different?

Answer 1

1) This is Avast
2) Let the client check the browser itself for third-party plugins

Answer 2

The problem was in the client's browser. Thank you.