Setup.dll is a Windows DLL file. DLL is the abbreviation for Dynamic Link Library. DLL files are needed by programs or web browser extensions, because they contain program code, data, and resources. You can fix your Setup.dll problem by downloading the correct Setup.dll file. The following information can help you determine if Setup.dll is a Windows system file or if it belongs to an application that you can trust.
The process belongs to software Setup by unknown.
Description: Setup.dll is not essential for Windows and will often cause problems. The Setup.dll file is located in the C:\Windows\System32 folder (common is C:\Windows\all users\application data\setup\).
The file size on Windows 10/8/7/XP is 1,368,777 bytes.
The program has a visible window. The Setup.dll file is a file with no information about its developer. The software is loaded during the Windows boot process (see Registry key: Run, MACHINE\RunServices). The Setup.dll file is not a Windows system file. Setup.dll appears to be a compressed file. Therefore the technical security rating is 36% dangerous, however you should also read the user reviews.
Recommended: Identify Setup.dll related errors
If Setup.dll is located in a subfolder of the user's profile folder, the security rating is 82% dangerous. The file size is 157,696 bytes. There is no description of the program. The program is not visible. It is able to change the behavior of, or monitor Internet Explorer. There is no detailed description of this service. The file is not a Windows core file. Setup.dll appears to be a compressed file.
External information from Tony Klein:
Important: Some malware camouflages itself as Setup.dll. Therefore, you should check the Setup.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.
A clean and tidy computer is the key requirement for avoiding problems with Setup. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic 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 resmon 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 DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.
To help you analyze the Setup.dll process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.