When dealing with a corrupted opencl.dll in Windows 10 (specifically Build 10586), standard repair tools like sfc /scannow and DISM /Online /Cleanup-Image /RestoreHealth may fail when:

• The local component store is corrupted
• Your network enforces WSUS server usage instead of Microsoft's public update servers

The critical error patterns you'll encounter:

CSI 00003c3a Hashes for file member \\SystemRoot\\WinSxS\\...\\opencl.dll do not match
CSI 00003c3b [SR] Cannot repair member file [l:10]\"opencl.dll\"
CBS_E_SOURCE_MISSING (0x800f081f)

Method 1: Direct File Replacement (Quick Fix)

1. Identify working opencl.dll versions from a healthy Windows 10 machine (same build)
2. Replace files in these locations:

   C:\Windows\System32\opencl.dll
   C:\Windows\SysWOW64\opencl.dll
   C:\Windows\WinSxS\amd64_microsoft-windows-r..xwddmdriver-wow64-c_...\opencl.dll

3. Take ownership and set permissions:

   takeown /f C:\Windows\System32\opencl.dll
   icacls C:\Windows\System32\opencl.dll /grant administrators:F

Method 2: Offline Source Repair

Dism /Online /Cleanup-Image /RestoreHealth /Source:wim:D:\sources\install.wim:1 /LimitAccess

Where D:\sources\install.wim points to your Windows installation media.

For enterprise environments with WSUS restrictions:

@echo off
:: Temporarily disable WSUS for DISM operations
reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU" /v UseWUServer /t REG_DWORD /d 0 /f
net stop wuauserv

:: Perform DISM repair
Dism /Online /Cleanup-Image /RestoreHealth

:: Re-enable WSUS
reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU" /v UseWUServer /t REG_DWORD /d 1 /f
net start wuauserv

After repair, verify with:

fciv.exe -sha1 C:\Windows\System32\opencl.dll
sfc /verifyonly

• Maintain a clean Windows image backup
• Configure WSUS to synchronize servicing stack updates
• Regularly check component store health:

  Dism /Online /Cleanup-Image /StartComponentCleanup

After upgrading to Windows 10 Pro Version 1511 (Build 10586), I encountered corrupted opencl.dll files in multiple locations. Standard repair tools failed:

sfc /scannow
Dism /Online /Cleanup-Image /RestoreHealth

Both commands returned hash mismatch errors, indicating deeper system corruption:

Found: {l:32 g2VAunZ6/2J1G3oL7kf9fjInPUA9VYeiJcl9VKgizaY=} 
Expected: {l:32 9rnAnuwzPjMQA7sW63oNAVhckspIngsqJXKYSUeQ5Do=}

The root cause was two-fold:

• Local component store corruption
• WSUS server configuration preventing access to Microsoft's update servers

Error 0x800f081f (CBS_E_SOURCE_MISSING) confirmed the system couldn't fetch repair files.

Here's the step-by-step solution that worked:

# 1. Download clean Windows 10 ISO matching your build
# 2. Mount ISO and identify clean opencl.dll
# 3. Replace corrupted files manually:

takeown /f C:\Windows\SysWOW64\opencl.dll
icacls C:\Windows\SysWOW64\opencl.dll /grant administrators:F
copy clean_opencl.dll C:\Windows\SysWOW64\opencl.dll /y

# 4. Repair component store:
Dism /Online /Cleanup-Image /RestoreHealth /Source:wim:X:\sources\install.wim:1 /LimitAccess

For developers needing to fix multiple machines, here's a PowerShell script:

# Fix-OpenCL.ps1
$cleanDllPath = "\\network\share\clean_files\opencl.dll"
$sysWow64Path = "$env:windir\SysWOW64\opencl.dll"

try {
    if (Test-Path $sysWow64Path) {
        Take-Ownership -Path $sysWow64Path
        Grant-FullControl -Path $sysWow64Path -Principal "Administrators"
        Copy-Item $cleanDllPath $sysWow64Path -Force
        Write-Host "File replaced successfully"
        
        # Verify hash
        $expectedHash = "9rnAnuwzPjMQA7sW63oNAVhckspIngsqJXKYSUeQ5Do="
        $actualHash = (Get-FileHash $sysWow64Path -Algorithm SHA256).Hash
        if ($actualHash -eq $expectedHash) {
            Write-Host "Hash verification passed"
        } else {
            Write-Warning "Hash mismatch detected"
        }
    }
} catch {
    Write-Error "Repair failed: $_"
}

For development environments:

• Maintain a library of known-good system files
• Implement hash verification in deployment scripts
• Consider WSUS configuration alternatives for developer machines

Example hash verification batch script:

@echo off
set "file=%windir%\SysWOW64\opencl.dll"
set "expected=9rnAnuwzPjMQA7sW63oNAVhckspIngsqJXKYSUeQ5Do="

certutil -hashfile "%file%" SHA256 | find /i "%expected%" >nul
if errorlevel 1 (
    echo Corruption detected in %file%
    call :repair
) else (
    echo File verification passed
)
goto :eof

:repair
echo Initiating repair procedure...
REM Insert repair commands here