Most antivirus programs identify mdi564.dll as malware—e.g. BitDefender identifies it as Trojan.Generic.14794613, and Symantec identifies it as Trojan Horse.
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The mdi564.dll process does not contain any data about its author.
Description: Mdi564.dll is not essential for Windows and will often cause problems. The mdi564.dll file is located in a subfolder of Windows folder for temporary files (mostly C:\Users\USERNAME\AppData\Local\Temp\).
The file size on Windows 10/8/7/XP is 2,923,520 bytes.
The program has a visible window. There is no description of the program. The software starts upon Windows startup (see Registry key: Run). It is not a Windows system file. Mdi564.dll is able to record keyboard and mouse inputs. Therefore the technical security rating is 36% dangerous.
Recommended: Identify mdi564.dll related errors
If mdi564.dll is located in a subfolder of the user's profile folder, the security rating is 68% dangerous. The file size is 140,800 bytes. The program has a visible window. It is a file with no information about its developer. The process starts upon Windows startup (see Registry key: Run). The file is not a Windows system file.
Important: You should check the mdi564.dll process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.
The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active mdi564 process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-malware tool tells you if the mdi564.dll on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.
A clean and tidy computer is the key requirement for avoiding PC trouble. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.
Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.