The qbfsdaddin.dll file is a module that belongs to Quickbooks from Intuit, Inc. QuickBooks is an accounting program that is popular with small businesses and widely used. A dll (dynamic link library) file is a module that holds pieces of code and instructions that a program may call into action when needed instead of having it sit in memory slowing your computer.
The registry is a complicated database that tracks all the files installed on your computer. Each file has an entry in the registry that tells Windows how to find and run that file, and what programs use it. A single mistake in the registry can result in a program not being able to run.
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