Yeap. That summarizes our issue.

The next step for us is to hire PR and go public. We are spending 1500$ per month on google adwords now.

May be use that money to get some legal help. In a physical world it is a clear public defamation case.

Get a lawyer. Send a demand letter to Google's corporate counsel that they stop falsely identifying your software as dangerous. Fax, FedEx, and email it. If they don't respond in 24 hours, have your lawyer file an emergency injunction in federal court.

Google's failure to respond to issues like this is appalling, and it's probably going to take a lawsuit and public embarrassment to get them to stop being evil.