My antivirus warns me that my website is infected with a trojan. What should I do?

Just some days ago I found out that I can not browse my website. My Kaspersky antivirus detect the Trojan “HEUR:Trojan.Script.Generic” on the website and shows me a banner about this:

How can I investigate this issue and … Continue reading My antivirus warns me that my website is infected with a trojan. What should I do?