Detect and repair supported missing, corrupted, incompatible, or conflicting DLL files—without guessing, replacing protected files manually, or downloading unknown DLLs.
Follow the guided manual steps yourself, or use Advanced PC Repairs to scan the computer and identify supported Windows conditions that may need attention.
Manual repair
Automatic-assisted option
Install Advanced PC Repairs and run a scan for supported Windows conditions related to system files, stability, and performance.
CHECKMARK CERTIFIED TEST REPORT
In a scoped Checkmark Certified test, Advanced System Repair Pro detected, repaired, and verified 20 deliberately altered Windows system files.
Advanced PC Repairs distributes the Advanced System Repair software evaluated in this report. Results reflect the report's specific test environment and do not guarantee repair of every Windows or DLL error.
View the complete DLL test reportA dynamic-link library (DLL) contains code or resources that Windows and applications can share. When a program starts, Windows must locate the right dependencies, load compatible versions, and resolve the functions the program expects. “DLL not found” is only one failure mode: a file can exist and still be the wrong architecture, wrong version, blocked, damaged, or dependent on another missing component.
| Message or symptom | Likely category | Best first action |
|---|---|---|
VCRUNTIME140.dll, MSVCP140.dll, or api-ms-win-crt-*.dll missing | Microsoft Visual C++ runtime | Repair or install the official supported Visual C++ Redistributables—usually both x64 and x86. |
d3dx9_43.dll, xinput1_3.dll, or XAudio2_7.dll missing | Legacy DirectX side-by-side component | Repair the game prerequisites or install Microsoft’s official DirectX End-User Runtime package. |
| “Entry point not found” or “procedure could not be located” | Version conflict or mixed application files | Repair/reinstall the affected app; do not replace just one DLL from another PC. |
0xc000007b or “Bad Image” | Architecture mismatch, runtime, app, or system corruption | Identify the affected app, repair its runtime dependencies, then check Windows files. |
| Many unrelated Windows apps fail | Windows component-store or system-file damage | Run DISM, then SFC, and install pending Windows updates. |
| Only one app or game fails after an update | Application files, plug-in, mod, or security quarantine | Verify/repair or reinstall that app; review protection history and recent changes. |
Write down the DLL filename, error code, program name, and the action that triggered it. Take a screenshot before closing the dialog. A filename without its context is rarely enough to choose the correct repair.
Restart Windows, then test again. Determine whether the error affects one program, one game, or many Windows components. If one app fails, begin with that app. If many unrelated apps fail, prioritize Windows repair.
Check whether the problem began after an app update, game mod, driver update, Windows update, security quarantine, cleanup action, or unexpected shutdown. Undo only the most relevant recent change.
Open Windows Security → Virus & threat protection → Protection history. Never restore a quarantined DLL unless you can verify its origin and safety. If files repeatedly become corrupt, also check disk health and memory rather than continually replacing files.
If only one program fails, this is usually the fastest and most accurate repair. In Settings → Apps → Installed apps, open the app’s advanced options and use Repair when available. For desktop software, rerun the original installer or reinstall the current version from the publisher. In Steam, Epic Games, or another launcher, use its verify/repair feature first.
Temporarily remove unsupported mods, overlays, injectors, and plug-ins. These often load their own DLL files and can break after an application or game update.
Applications compiled with Microsoft C++ frequently require a matching Visual C++ Redistributable. A 64-bit Windows installation can run both 64-bit and 32-bit programs, so installing both the supported x64 and x86 packages is often appropriate. Use the installer provided with the application or Microsoft’s official redistributable page.
If Windows features or several unrelated apps are affected, open Terminal or Command Prompt as administrator. Run the following command and allow it to complete even if progress appears to pause:
DISM services the Windows image and can restore component-store files used by System File Checker. Internet access may be needed. If DISM reports that source files could not be found, use matching Windows installation media and Microsoft’s documented source procedure rather than an unrelated DLL download.
After DISM completes, run:
Restart if repairs were made. If SFC reports that it found corrupt files but could not repair some of them, run DISM again, restart, and repeat SFC. Persistent failures may require an in-place Windows repair installation.
Install current Windows quality updates and supported application updates, then restart. If the error began immediately after an update, check the vendor’s known-issues page before removing updates. An update rollback is a targeted diagnostic step, not a permanent substitute for security updates.
If the failure began after a driver, application, or system change and a restore point exists, System Restore can return system files, registry configuration, and installed programs to an earlier state without deleting personal documents. Back up important files first and review the affected-programs list.
Modern Windows includes core DirectX components, but older games may rely on legacy side-by-side libraries that are not replaced by simply having “DirectX 12.” Start with the game launcher’s file verification and the prerequisite installers shipped with the game. Common prerequisite folders include names such as _CommonRedist, DirectX, or vcredist.
A clean boot loads Windows with a reduced set of third-party services and startup programs. If the error disappears, re-enable items in groups to identify the conflicting utility, overlay, security product, or updater. Restore normal startup after testing.
Search for “View reliability history” and select the failure time. Note the faulting application, faulting module, and exception code. Event Viewer can provide more detail, but a module name is not automatically the root cause—it can be the component where a failure surfaced.
Repeatedly damaged files, decompression failures, random crashes, or changing error messages may indicate storage, memory, thermal, or power instability. Back up important data before extended hardware testing.
regsvr32 registers self-registering COM components; it does not “repair DLL files” generally. Many DLLs have no registration entry point and should never be registered. Errors such as “DllRegisterServer was not found” can simply mean the file is not a registerable COM server.
Use regsvr32 only when the application vendor or Microsoft documentation identifies the exact component and command. On 64-bit Windows, System32 contains 64-bit system tools while SysWOW64 contains 32-bit tools—an unintuitive naming convention that makes guessed registration commands especially error-prone.
Consider an in-place repair when DISM and SFC cannot restore Windows, built-in features fail broadly, or corruption survives normal repairs. Use Microsoft’s current Windows installation media, choose the option to keep personal files and apps, confirm adequate disk space, disconnect nonessential peripherals, and back up first. Do not interrupt the installation.
| If this is true… | Do this first | Then |
|---|---|---|
| Only one app fails | Repair or reinstall the app | Repair its official runtime prerequisites |
| A Steam/Epic game fails | Verify game files | Run bundled DirectX/VC++ installers; check GPU driver |
| Many Windows features fail | DISM RestoreHealth | SFC /scannow, updates, restart |
| Error began after a driver/update | Review known issues and Reliability Monitor | Supported rollback or System Restore |
| Files keep becoming corrupt | Back up immediately | Test storage, RAM, malware, heat, and power stability |
Usually, no. The other copy may have a different Windows build, application version, architecture, language, signature, or dependencies. Use the application installer, Windows servicing tools, or the official runtime package.
The message may mean Windows cannot load it. The file could depend on another missing DLL, be the wrong 32/64-bit architecture, have an incompatible version, be blocked, or fail a signature or initialization check.
Often yes on 64-bit Windows, because 32-bit applications need x86 runtime components while 64-bit applications need x64 components. Follow the affected application’s documented requirements.
No. Some older games require optional legacy side-by-side DirectX components. Use the game’s prerequisite installer or Microsoft’s official legacy DirectX runtime package.
No. SFC repairs protected Windows system files. It will not normally replace a third-party application DLL, a game dependency, or every Visual C++ runtime file.
Download Advanced PC Repairs to scan for common Windows conditions that may contribute to errors, stability problems, or reduced performance.
Software installation is required. Scanning is free. Optional paid repairs or subscription plans are presented with pricing and renewal terms before purchase.