Have you used a registry cleaner? If you have, it could have deleted the icon references in the registry.
Lack of imagination, does the Website show another Control Panel icon for PeaZip 5.3.1. The Control Panel Icons are in C:\Windows\System 32 and has a extension of .cpl.
nope, didn't work I've googled this thing before starting this thread, found some others with the same issue but no explanation anyway, no biggie thanks to all