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. manually changing the registry could cause system critical errors if done incorrectly, the instructions below are not guaranteed to work on your particular system setup.
Settings Manager by Aztec Media Inc is technically not a virus, but it exhibit many malicious traits, such as rootkit 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".
Settings Manager is a potentially unwanted program that is designed to protect its own search engine (default-search.net). It is often installed when you install another free software that had bundled into their installation this program.
This program is also bundled within the custom installer on many reputable download sites, so if you have downloaded a software from these websites, chances are that Settings Manager by Aztec Media Inc was installed during the software setup process.
How to remove the Startup entry:
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 sysapcrt.dll.
Press CTRL+SHIFT+ESC at the same time to bring up the Task Manager. Under the tab "Start-up", uncheck any boxes relating to sysapcrt.dll.
Should you not find any references here to the sysapcrt.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.