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Existing suggestions from the thread, slightly re-worded in places:
[ol][li]Please try downloading the current version from our website and then installing it over the top, without uninstalling. Reboot when prompted at the end of the install.
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[li]Another thing to try: Create an empty folder on your desktop, then right-click it and choose the option to open it in Opus. If that works, it could have been Opus was trying to open a folder with something inside it that caused it to crash.
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[li]If you run this (e.g. paste it into Win + R "run" dialog), does the Preferences window appear?
"C:\Program Files\GPSoftware\Directory Opus\dopusrt.exe" /cmd Prefs
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[li]If none of the above work, try reverting to the default configuration, in case the problem is a config issue.
To do this, uninstall Opus, reboot when prompted, then reinstall Opus.
Uninstalling will wipe your configuration (which may be where the problem is), so if you do not already have a backup and want to keep your config, you will want to back it up first. If you can open a window one way or another, use the config backup wizard. Otherwise, to locate the configuration folders and do the backup manually, see Locating the config files by hand in the config backup faq.
Important: Please try running Opus with the default config before restoring anything from your config backup.[/li][/ol]
If none of those work, please give us details on how you are trying to open the new window, and the corresponding settings under Preferences / Launching Opus.