The only security software
I have running on my Windows 8 computer is Microsoft's Windows Defender. It hasn't given me any trouble installing any other software
I haven't tried to install a GPS
connection on the W8 computer because I know my BU-353 isn't compatible with W8. I haven't tried connecting my Garmin
GPS 72 to the W8 computer because I assume my cheap
RS-232 to USB adapter is also incompatible with W8.
I haven't had any trouble with OpenCPN on Windows Vista or Windows 7 (both with Microsoft Security
Essentials, which was renamed Windows Defender for W8). I dumped W7 for Ubuntu a couple betas back, so I no longer have a W7 test platform.
We need to hear from more W8 users who have installed the latest betas to figure out what is going on.
Windows is my least favorite operating system but it's the one I am most familiar with. I don't have any of these troubles on my Ubuntu computer but I have a much harder time figuring out how to do anything. Thirty years ago I was pretty conversant with Unix commands but I've forgotten almost all of that now.