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USB Virtual Com Port failures with Windows 7 64bit

Question asked by perowne.greg on Jun 17, 2012
Latest reply on Jun 17, 2012 by Chinzei.Tsuneo
I have an AIS650 connected with USB to PC running Windows 7 64bit. The STMicroelectronics VCP driver (v1.3.1) is loaded. The COM port keeps dropping out.
Sometimes the following error appears:

Activation context generation failed for "C:\Program Files (x86)\STMicroelectronics\Software\Virtual COM Port Driver\dpinst_ia64.exe". Dependent Assembly Microsoft.Windows.Common-Controls,language="*",processorArchitecture="ia64",publicKeyToken="6595b64144ccf1df",type="win32",version="6.0.0.0" could not be found. Please use sxstrace.exe for detailed diagnosis.


The software that is trying to use the COM port fails

The port 'COM6' does not exist.
System.IO.IOException: The port 'COM6' does not exist.
at MaxSea.IO.Ports.Internal.ThreadedPhysicalPort.Write(Byte[] buffer, Int32 count)
at lx.b().

This failure is a critical part of Navigation software and I need to find a solution to this issue. I would be grateful for any assistance.

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