Software & Apps Windows How to Fix Dnssd.dll Not Found or Missing Errors A Troubleshooting Guide for Dnssd.dll Errors by Tim Fisher General Manager, VP, Lifewire.com Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire. our editorial process Facebook Twitter LinkedIn Tim Fisher Updated on April 04, 2019 Lifewire Windows The Ultimate Laptop Buying Guide Tweet Share Email Dnssd.dll errors are caused by situations that lead to the removal or corruption of the dnssd DLL file. In some cases, dnssd.dll errors could indicate a registry problem, a virus or malware issue, or even a hardware failure. There are several different ways that dnssd.dll errors can show up on your computer. Here are some of the more common ways that you might see dnssd.dll errors: Dnssd.dll Not FoundThis application failed to start because dnssd.dll was not found. Re-installing the application may fix this problem.Cannot find [PATH]\dnssd.dllThe file dnssd.dll is missing.Cannot start [APPLICATION]. A required component is missing: dnssd.dll. Please install [APPLICATION] again. The context of the dnssd.dll error is an important piece of information that will be helpful while solving the problem. Dnssd.dll is a file used by Apple software such as Bonjour, so error messages most often occur while using or installing Apple software programs, but might also be seen when Windows first starts up. Because Apple products use dnssd.dll, it's stored in the %programfiles%\iTunes folder. The dnssd.dll error message might also apply to other programs or systems that might utilize the file on any of Microsoft's operating systems including Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, and Windows 2000. How to Fix Dnssd.dll Errors Do not download dnssd.dll from a "DLL download" website. There are many reasons why downloading a DLL file is a bad idea. If you need a copy of dnssd.dll, it's best to obtain it from its original, legitimate source. Start Windows in Safe Mode to complete any of the following steps if you're unable to access Windows normally due to the dnssd.dll error. Restore dnssd.dll from the Recycle Bin. The easiest possible cause of a "missing" dnssd.dll file is that you've mistakenly deleted it. If you suspect that you've accidentally deleted dnssd.dll but you've already emptied the Recycle Bin, you may be able to recover dnssd.dll with a free file recovery program. Recovering a deleted copy of dnssd.dll with a file recovery program is a smart idea only if you're confident you've deleted the file yourself and that it was working properly before you did that. Run a virus/malware scan of your entire system. Some dnssd.dll errors could be related to a virus or other malware infection on your computer that has damaged the DLL file. It's even possible that the dnssd.dll error you're seeing is related to a hostile program that's masquerading as the file. Reinstall the program that uses the dnssd.dll file. If the dnssd.dll DLL error occurs when you use a particular program, reinstalling the program should replace the file. For example, completely uninstall and then reinstall iTunes if you see the dnssd.dll error there.One exception that some users have had trouble with is if you see the dnssd.dll error after installing Apple's AirPort Utility. That program requires Bonjour, and might throw the dnssd.dll error (and reference APAgent.exe) if you don't have it installed. So, in this instance, you'd want to install Bonjour and not reinstall AirPort Utility. Try your best to complete this step. Reinstalling the program that provides the dnssd.dll file, if possible, is a likely solution to this DLL error. Alternatively, if you know for sure that you won't be using any other Apple program besides, say, iTunes, you can uninstall all the Apple products you currently have and then reinstall just the one you need. Doing that should clear the dnssd DLL error. Use System Restore to undo recent system changes. If you suspect that the dnssd.dll error was caused by a change made to an important file or configuration, a System Restore could solve the problem. Update the drivers for hardware devices that might be related to dnssd.dll. If, for example, you're receiving a "The file dnssd.dll is missing" error when you play a 3D video game, try updating the drivers for your video card. The dnssd.dll file may or may not be related to video cards - this was just an example. The key here is to pay very close attention to the context of the error and troubleshoot accordingly. Roll back a driver to a previously installed version if dnssd.dll errors began after updating a particular hardware device's driver. Test your memory and then test your hard drive. I've left the majority of hardware troubleshooting to the last step, but your computer's memory and hard drive are easy to test and are the most likely components that might cause dnssd.dll errors as they fail. If the hardware fails any of your tests, replace the memory or replace the hard drive as soon as possible. Repair your installation of Windows. If the individual dnssd.dll file troubleshooting advice above is unsuccessful, performing a startup repair or repair installation should restore all Windows DLL files to their working versions. Use a free registry cleaner to repair dnssd.dll related issues in the registry. A free registry cleaner program may be able to help by removing invalid dnssd.dll registry entries that might be causing the DLL error. Perform a clean installation of Windows. A clean install of Windows will erase everything from the hard drive and install a fresh copy of Windows. If none of the steps above correct the dnssd.dll error, this should be your next course of action. All the information on your hard drive will be erased during a clean install. Make sure you've made the best attempt possible to fix the dnssd.dll error using a troubleshooting step prior to this one. Troubleshoot for a hardware problem if any dnssd.dll errors persist. After a clean install of Windows, your DLL problem can only be hardware related. Need More Help? If you're not interested in fixing this problem yourself, see How Do I Get My Computer Fixed? for a full list of your support options, plus help with everything along the way like figuring out repair costs, getting your files off, choosing a repair service, and a whole lot more.