Try pre-downloading the ISO to your desktop and providing the file to UNetbootin manually (on Windows); do you get the same error? As for "stops", how long did you wait before closing it (it may take a while to extract)? As for the error on PCLinuxOS, try entering the command "7z" on the terminal, the command isn't found right? Are there any other p7zip/7-zip packages in the PCLOS repos, try installing them if there are.
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