The qbdinstallmgr.dll file is a component of the QBAgent of QuickBooks from Intuit, Inc. The QBAgent is a module that checks for updates from the internet, running in the background while you do other work. QuickBooks is accounting software for small businesses.
So an error with this file may disable updates to QuickBooks that you could need. Fixing this error may require a reinstallation of QuickBooks, but you should try fixing it by cleaning your registry first.
The registry is a database that Windows uses to track all the files installed on your computer. Because it is used constantly by Windows, sometimes errors creep into registry entries. Part of your regular computer maintenance should be cleaning the registry to fix these errors, and when you get a dll file error the problem is almost certainly related to the registry.
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