For a while, there was a free virtual serial port driver that was signed. But the author of that driver had to pull it from availability because of a license issue with a third party component utilized in the driver. With that gone, there were no free signed drivers. To address this issue, I have obtained the certificate necessary to do the signing process, and am donating this service to the com0com open source virtual serial port project. The author of that software has added me as a developer on that project, and I'm working with him to provide signed 64-bit versions.
He will put together the next release containing the signed drivers, but I have a version that can be used to beta test. So if a couple people that are already using com0com on 64 bits using windows test mode can email me at support at softwx.com, I will send you the signed version to try out. I'd like you to take windows out of test mode, test that the driver no longer works in normal windows, then update the driver with files I will send you, then test that the updated driver works. This test will only work if you already have com0com installed, as I don't have a whole installer package built. I only have the new signed driver, catalog, and inf file.
Steve