This file has been reported to be part of a spyware/malware/trojan. It is likely that the problem you are experiencing is linked directly to the spyware/malware/trojan rather than an actual missing DLL-file and the recommended course of action is to first locate/remove the Malware. We do not recommend downloading this file.
DLL-Files.com Support says:
This is a possible manual solution for you 'handyman-fixers' out there:
WARNING: Do this at your own risk. The instructions below are not guaranteed to work on your particular system setup.
datamngr.dll is a part of a software from bandoo media inc. It might technically not be a virus, but it exhibit many malicious traits, such as capabilities to hook deep into the operating system, browser hijacking, and interfering with your daily computer use. The industry generally refers to it as a "PUP".
datamngr.dll has been identified as the following threats;
- Bandoomed.149
- Trojan.Win32.Generic!BT
- Win-PUP/SearchSuite
- PUA.Win32.Toolbar.SearchSuite
- W32.HfsAdware.1843
- Adware.Bandoo.274
- Win32/Toolbar.SearchSuite potentially unwanted
"Bandoo media inc." is often bundled to freeware or shareware applications.
How to stop this PUP from loading with Windows:
Win XP, VISTA, 7:
Press "Windows"-key + "R" to bring up the "Run" dialogue. In "Run" dialogue type "msconfig" and hit Enter Under the tab "Startup", uncheck any boxes relating to datamngr.dll.
Win 8:
Press CTRL+SHIFT+ESC at the same time to bring up the Task Manager. Under the tab "Start-up", uncheck any boxes relating to datamngr.dll.
Should you not find any references here to the datamngr.dll , try the Microsoft program Sysinternals Autoruns. Available for free at: http://technet.microsoft.com/en-US/sysinternals/bb963902.aspx
This stops the error message. You may then proceed with your preferred malware cleaner, antivirus, removal tools, to remove the malicious software.
Also make sure to reset your internet browsers, making sure startpage and default search engine are not changed.