Software & Apps Windows How to Fix Npptools.dll Not Found or Missing Errors A troubleshooting guide for npptools.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 17, 2020 Windows The Ultimate Laptop Buying Guide Tweet Share Email Npptools.dll errors are caused by situations that lead to the removal or corruption of the npptools DLL file. In some cases, npptools.dll errors could indicate a registry problem, a virus or malware issue, or even a hardware failure. The npptools.dll error message is most likely seen only on Windows XP and older versions of Windows, but it might apply to any program or system that utilizes the file on Microsoft's other operating systems, too, including Windows 10, Windows 8, Windows 7, and Windows Vista. Npptools.dll Errors There are several different ways that npptools.dll errors can show up on your computer. Here are some of the more common ways that you might see npptools.dll errors. Npptools.dll Not FoundThis application failed to start because npptools.dll was not found. Re-installing the application may fix this problemCannot find [PATH]\npptools.dllThe file npptools.dll is missingCannot start [APPLICATION]. A required component is missing: npptools.dll. Please install [APPLICATION] again Npptools.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 npptools.dll error is an important piece of information that will be helpful while solving the problem. How to Fix Npptools.dll Errors Do not download npptools.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 npptools.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 npptools.dll error. Restore npptools.dll from the Recycle Bin. The easiest possible cause of a "missing" npptools.dll file is that you've mistakenly deleted it. If you suspect that you've accidentally deleted npptools.dll but you've already emptied the Recycle Bin, you may be able to recover npptools.dll with a free file recovery program. Recovering a deleted copy of npptools.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 npptools.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 npptools.dll error you're seeing is related to a hostile program that's masquerading as the file. Reinstall the program that uses the npptools.dll file. If the npptools.dll DLL error occurs when you use a particular program, reinstalling the program should replace the file. Some WinPcap users have seen this DLL error fixed after reinstalling that program, so you might try that first if the error is, in some way, related to a program that relies on WinPcap. Try your best to complete this step. Reinstalling the program that provides the npptools.dll file, if possible, is a likely solution to this DLL error. Use System Restore to undo recent system changes. If you suspect that the npptools.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 npptools.dll. If, for example, you're receiving a "The file npptools.dll is missing" error when you play a 3D video game, try updating the drivers for your video card. The npptools.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 npptools.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. While the npptools.dll file isn't provided by Microsoft, it could depend on one of these updates in order to work properly. 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 npptools.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 npptools.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 npptools.dll related issues in the registry. A free registry cleaner program may be able to help by removing invalid npptools.dll registry entries that might be causing the DLL error. We rarely recommend the use of registry cleaners. They're included as an 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 npptools.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 npptools.dll error using a troubleshooting step prior to this one. Troubleshoot for a hardware problem if any npptools.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.