System Workbench doesn’t actually store values in Windows registry.
Is your project a new one or the old one imported into new workspace ?
Which board did you select when creating the project ?
Can you verify there is still no special character in the project location or the installation location ?
Please copy the console output for us to get more details on the problem.
For information, the debug uses a TCP/IP port (that can be chosen in the debug configuration page) to create communication between GDB and OpenOCD.