I have deployed Juniper Network Connect on three different Windows 10 installations and never really experienced a problem. Except for a Windows 10 virtual machine in Hyper-V, which gave me the error ‘Cannot start the Network Connect service. Please re-install Network Connect’. nc.windows.app.23787.
As I’m not trying to find a root cause for the problem here, just a quick fix, I present you the quick fix 🙂 Please look into the Computer Management => Services. You can see that Juniper is supposed to be automatically started – but it is not. Just start the service and Juniper NC will work just fine.