A clean installation can be good sometimes when it behaves strange. We have noticed that updates of Windows can generate some strange behavior sometimes.
This will delete all settings so make sure you have all information you need to connect to the cameras again.
-start installation program and select Remove.
-go to C:\ProgramData\Moonware\Netcam Studio\Server and delete all. If you have a licensed version copy Lic.dat to a safe place. If you have a lot of recordings you need to save leave the Library folder.
-go to C:\Users%username%\AppData\Local\Moonware and delete all.
-go to C:\Users%username%\AppData\Roaming\Moonware and delete all.
-install the latest version of NCS. Make sure it installs from an Admin account.
-copy back the file Lic.dat.
Now it will work better, hopefully.