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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.
Your first and easiest option is to get a reliable anti-malware software suite to scan your system and clean out any possible infestation. We strongly recommend Malwarebytes' Anti-Malware Premium as the current best option on the market.
Malwarebytes Anti –Malware Premium detects and removes rootkits, Potentially Unwanted Programs (PUPs), Trojans, worms, and other suspicious code that your antivirus won’t detect. Small, light, and compatible with antivirus suites, it’s the anti-malware computer technicians themselves use at home and on the job. Try Malwarebytes, the Leader in Malware Removal
DLL-Files.com Support says:
Identified as A "bookedspace malware" variant.
Manual removal is, technically, possible, but includes removing up to 40-50 separate keys in the registry and a number of other actions including removal of autostart entries, appdata folders and individual .dll files. In short, We can't recommend anyone doing this on their own. Malwarebytes Anti Malware will kill this one for you.