Software & Apps Windows How To Fix Iphlpapi.dll Not Found or Missing Errors A Troubleshooting Guide for Iphlpapi.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 July 01, 2019 Iphlpapi.dll Error Message. Windows The Ultimate Laptop Buying Guide Tweet Share Email Iphlpapi.dll errors are caused by situations that lead to the removal or corruption of the iphlpapi DLL file. In some cases, iphlpapi.dll errors could indicate a registry problem, a virus or malware issue, or even a hardware failure. This DLL file name stands for IP helper application programming interface. You can read more about the iphlpapi module on Microsoft's website. There are several different ways that iphlpapi.dll errors can show up on your computer. Here are some of the more common ways that you might see iphlpapi.dll errors: Iphlpapi.dll Not FoundThis application failed to start because iphlpapi.dll was not found. Re-installing the application may fix this problem.Cannot find [PATH]\iphlpapi.dllIphlpapi.dll Cannot StartThe file iphlpapi.dll is missing.Cannot start [APPLICATION]. A required component is missing: iphlpapi.dll. Please install [APPLICATION] again. Iphlpapi.dll error messages might appear while using or installing certain programs, when Windows starts or shuts down, or maybe even during a Windows installation. The context of the iphlpapi.dll error is an important piece of information that will be helpful while solving the problem. The iphlpapi.dll error message could apply to any program or system 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 Iphlpapi.dll Errors Do not download iphlpapi.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 iphlpapi.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 iphlpapi.dll error. Restore iphlpapi.dll from the Recycle Bin. The easiest possible cause of a "missing" iphlpapi.dll file is that you've mistakenly deleted it. If you suspect that you've accidentally deleted iphlpapi.dll but you've already emptied the Recycle Bin, you may be able to recover iphlpapi.dll with a free file recovery program. Recovering a deleted copy of iphlpapi.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. Reinstall the program that uses the iphlpapi.dll file. If the iphlpapi.dll DLL error occurs when you use a particular program, reinstalling the program should replace the file. Try your best to complete this step. Reinstalling the program that provides the iphlpapi.dll file, if possible, is a likely solution to this DLL error. If the DLL error is seen when playing a Steam game, try renaming the iphlpapi.dll file to something else to force the game to use an updated version of the iphlpapi.dll file. To do this, go into the installation folder for the game and rename the iphlpapi.dll file to something else like iphlpapi_old.dll. This will stop the game from using that specific DLL file; it will instead revert to a newer version included with Windows. This step is only useful if the game is old enough that it's using an outdated version of the iphlpapi.dll file. If you can't find the iphlpapi.dll file, search for it with a free file search tool like Everything. Update the drivers for hardware devices that might be related to iphlpapi.dll. If, for example, you're receiving a "The file iphlpapi.dll is missing" or "iphlpapi.dll file cannot start" error when you're using the internet, try updating the drivers for your network card. Microsoft has some more information on the iphlpapi.dll file and a solution for when it occurs while installing Microsoft Broadband Network hardware. Roll back a driver to a previously installed version if iphlpapi.dll errors began after updating a particular hardware device's driver. Install any available Windows updates. Many service packs and other patches replace or update some of the hundreds of Microsoft distributed DLL files on your computer. The iphlpapi.dll file could be included in one of those updates. Run a virus/malware scan of your entire system. Some iphlpapi.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 iphlpapi.dll error you're seeing is related to a hostile program that's masquerading as the file. Use System Restore to undo recent system changes. If you suspect that the iphlpapi.dll error was caused by a change made to an important file or configuration, a System Restore could solve the problem. Run the sfc /scannow System File Checker command to replace a missing or corrupt copy of the iphlpapi.dll file. If this DLL file is provided by Microsoft, the System File Checker tool should restore it. 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 iphlpapi.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 iphlpapi.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 iphlpapi.dll related issues in the registry. A free registry cleaner program may be able to help by removing invalid iphlpapi.dll registry entries that might be causing the DLL error. I rarely recommend the use of registry cleaners. I've included the option here as a "last resort" attempt before the destructive step coming up next. 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 iphlpapi.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 iphlpapi.dll error using a troubleshooting step prior to this one. Troubleshoot for a hardware problem if any iphlpapi.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 my How Do I Get My Computer Fixed? piece 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.