Traditional porn blocking tools limit your choice of image search engines, rely on constantly outdated URL blacklists...
— How to fully uninstall Picblock if you can't remember the password?
According to the information found on the developer's website under the Troubleshooting category, this is what I have found regarding your issue: "If you forget your PicBlock administrator password..., there is no way to recover it. Uninstall and reinstall the program."
As it says above, remove the program and then install it back.
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