The naiannps.dll file is part of the McAfee VirusScan API from Network Associates, Inc. An API (application programming interface) allows a program to interact with other software directly. This API works with McAfee to let scans work closely with particular programs. A problem with this file may cause problems with your antivirus and leave parts of your system unprotected. You should be able to fix this problem by cleaning your registry.
The registry database is the heart of Windows, keeping track of everything installed on your system. If there is a mistake in a registry entry, Windows may have a problem running your software. ZookaWare PC Cleaner cleans up the mistakes in the registry that stop your programs. ZookaWare PC Cleaner has a unique guarantee that means your computer’s registry will be fixed in good time. Try a free ZookaWare PC Cleaner scan to see what mistakes may be lurking in your registry.