Software & Apps Windows How to Fix Atl100.dll Not Found or Missing Errors A troubleshooting guide for atl100.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 May 18, 2020 Windows The Ultimate Laptop Buying Guide Tweet Share Email Atl100.dll errors are caused by situations that lead to the removal or corruption of the atl100 DLL file. In some cases, atl100.dll errors could indicate a registry problem, a virus or malware issue, or even a hardware failure. The atl100.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. Atl100.dll Errors There are several different ways that atl100.dll errors can show up on your computer. Here are some of the more common ways that you might see atl100.dll errors: Atl100.dll Not FoundThis application failed to start because atl100.dll was not found. Re-installing the application may fix this problem.Cannot find [PATH]\atl100.dllThe file atl100.dll is missing.Cannot start [APPLICATION]. A required component is missing: atl100.dll. Please install [APPLICATION] again. The context of the atl100.dll error is an important piece of information that will be helpful while solving the problem. Atl100.dll error messages might appear while using or installing certain programs or games (such as Scarlet Blade), when Windows starts or shuts down, or maybe even during a Windows installation. How to Fix Atl100.dll Errors Do not download atl100.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 atl100.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 atl100.dll error. Download and install the Microsoft Visual C++ 2010 Service Pack 1 Redistributable Package MFC Security Update. This will replace/restore the atl100.dll with the most recent copy provided by Microsoft. You're given a few download options from Microsoft for this update, based on the version of Windows you have installed—x86 (32-bit) or x64 (64-bit) How to Tell If You Have Windows 64-Bit or 32-Bit Try your best to complete this step. Applying this update is almost always the solution to atl100.dll errors. Restore atl100.dll from the Recycle Bin. The easiest possible cause of a "missing" atl100.dll file is that you've mistakenly deleted it. If you suspect that you've accidentally deleted atl100.dll but you've already emptied the Recycle Bin, you may be able to recover atl100.dll with a free file recovery program. Recovering a deleted copy of atl100.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 atl100.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 atl100.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 atl100.dll error was caused by a change made to an important file or configuration, a System Restore could solve the problem. Reinstall the program that's producing the atl100.dll error. If the atl100.dll error occurs when you use a particular program, reinstalling that program might help. 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 atl100.dll file could be included in one of those updates. Test your memory and then test your hard drive. We'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 atl100.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 atl100.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 atl100.dll related issues in the registry. A free registry cleaner program may be able to help by removing invalid atl100.dll registry entries that might be causing the DLL error. We rarely recommend the use of registry cleaners (see our Registry Cleaners FAQ for more on when to use one). They're included 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 atl100.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 atl100.dll error using a troubleshooting step prior to this one. Troubleshoot for a hardware problem if any atl100.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.