The n5setsecurity.npp file comes from N5SetSecurity by Nitro PDF. Most people use the free Adobe Reader to read PDFs but the free Adobe only lets you read PDF. Nitro PDF allows users to create, edit, and collaborate with PDF files.
The n5setsecurity.npp error is a registry error. All computers get registry errors at some point. Symptoms of registry errors include slow running computer, program crashes, Windows crashes, invalid file errors, execution errors, and the “Blue Screen of Death.” The only way to prevent registry errors is by regularly cleaning the computer registry with a high quality registry cleaner.
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