Hi I moved this to the Corporate Assistance area as a more appropriate spot for it.
You should submit details of your software using this form: Detection Dispute Submission | McAfee Labs
I see you've also been answered in another thread. Follow the advice of either one of both if you wish.
As a matter of fact it's not the complete answer and still the problem persists with programs made using NSIS. I have sent one to inspection right now.
For McAfee Web Gateway detections - you could follow this submission route to dispute false positives.
Web Gateway: How to submit virus and anti-malware samples (false positives or false negatives) for analysis