You have probably entered a wrong COM port number and ticked the "Auto connect to ECU" option. To fix the problem you will need to reset the registry settings.
- Go to start->Run and type regedit.
- Go to "HKEY_CURRENT_USER\Software\VB and VBA Program Settings\NDataScan" and delete the whole NDataScan entry.
- Close the Registry Editor and try running the software again. It will save the default settings to the registry file.
Don't tick the "Auto connect to ECU" option until you successfully establish a connection.
Warning: Take note of your Activation Key, you will need to re-enter it to activate the software.