Please, note that the ports, created by Virtual Serial Port ActiveX Control do not recover after system reboot.
We would appreciate if you send us the minidump. It is created each time BSOD is experienced.
To know the location of the Dump file on your PC do the following: right-click "My Computer" -> Properties -> Advanced -> in Setup and Recovery section cliсk Settings and refer to "Write debugging information" section to see the location of Dump file.
Please, let us know, whether your service just creates the COM port or creates virtual serial port and starts data transferring.