Investigate & Fix My Malware Issue

My website seems to have a malware problem. Some web developers have checked and found no malicious code, yet sites like VirusTotal flag it. Sucuri, on the other hand, detects nothing.

Here's the current situation:
- If a desktop or laptop has antivirus, my website doesn't open. If it doesn't, it opens fine.
- Recently, we made a few changes to the site, like removing a mandatory video option among other backend tweaks.

I need an expert who can:
- Thoroughly investigate my website for any potential malware or issues that might be causing this.
- Provide solutions to get my website running smoothly across all devices and antivirus systems.

Ideal skills would include:
- Extensive experience in cybersecurity and web development.
- Proficiency in using advanced security tools.
- Ability to troubleshoot and solve complex technical problems.