I was using the NVA6100. It was working OK. But after I upgraded my computer from windows 7 32 bits to 64 bits. It is not working now. I didn’t encounter any error message while installing the software, and the COM port looks ok. When I tried to use RadarScope. I could not connect to the COM Port. The error message was as follows. Can someone help? Thank you! System time: 07/12/2017 16:55:27 ** Error message: Connection error - Check COM-port! Cannot connect to COM38: Timeout during read from COM device (Error code: -6) **Libary Stack trace: at: WaitForTagData in .\appcore.c:1198 from: UpdateSymbols in .\appcore.c:1431 from: NVA_NewRadar in .\appcore.c:162 **Radarlib version: 2.2.2 ** NVA Stack trace: at Novelda.Radarlib2Wrapper.RadarWrapper.Open(String portName) at Novelda.RadarObjects.RadarControl.Initialize(Object owner) at Novelda.RadarScope.MainForm.ConnectRadar() **Version info: Product version: 184.108.40.206 Assembly version : 1.0.4399.25124 **System info: OS version: Microsoft Windows NT 6.1.7601 Service Pack 1 Processor Count: 4 CPU usage: 0.1594998% Available Memory: 12052MB Uptime: 0 days, 1 hours, 40 minutes, 19 seconds.