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Get the fix for the error  <strong>MPR.dll not found</strong> on <strong>Windows XP, <strong>Windows Vista,</strong><strong> Windows 7, Windows 8 and Windows 10</strong>.</strong>
<h2>About "MPR.dll not found"</h2>
[kbintro]
<h3><span id="Description_and_Symptoms">Description and Symptoms</span></h3>
The error messages, alerts, warnings, and symptoms below are tied to this error.
<h3>Symptom 1: "MPR.dll not found" error screen on startup</h3>
MPR.dll(Multiple Provider Router) is a Windows module that contains functions used to handle communication between the Windows operating system and the installed network providers. The module has software components which allows multiple network protocols to function easily and communicate with each other at the same time. If this file becomes missing or corrupt, the "MPR.dll not found" error screen appears.

Here is an example of "MPR.dll not found" error screen for Windows XP, Vista and Windows 7:

<a href="https://neosmart.net/blog/wp-content/uploads/sites/5/2016/06/VirtualBox_WinXP_clean_08_06_2016_14_29_42.png"><img class="alignnone wp-image-4300 size-full" src="https://neosmart.net/blog/wp-content/uploads/sites/5/2016/06/VirtualBox_WinXP_clean_08_06_2016_14_29_42.png" alt="MPR.dll not found Win XP, Vista, 7" width="800" height="600" /></a>
<pre>lsass.exe - Unable To Locate Component
This application has failed to start because MPR.dll was not found. Re-installing the application may fix the problem.</pre>
On Windows 8 and Windows 10 this error generates a more generic "It looks like Windows didn't load correctly" error screen:

<a href="https://neosmart.net/blog/wp-content/uploads/sites/5/2016/06/Windows_8_couldnt-load1.png"><img class="alignnone wp-image-4302 size-large" src="https://neosmart.net/blog/wp-content/uploads/sites/5/2016/06/Windows_8_couldnt-load1-1024x768.png" alt="MPR.dll not found Win 8, 10" width="980" height="735" /></a>
<pre>Recovery

It looks like Windows didn't load correctly
If you'd like to restart and try again, choose "Restart my PC" below. Otherwise, choose "See advanced repair options" for troubleshooting tools and advanced options. If you don't know which option is right for you, contact someone you trust to help with this.</pre>
<h2>Causes of this Error</h2>
This error has been known to occur as a result of one of the following causes:
<h3>Cause 1: MPR.dll file is corrupt or missing</h3>
Virus attacks, power outages and disk write errors may cause files to become missing or corrupt. If that's the case, then the operating system can't find the MPR.dll file, and the boot process is halted with a "MPR was not found " error.
<h2><span id="Fixing_8220Fatal_INT18_Boot_failure8221_on_Windows">Fixing “MPR.dll not found” on Windows</span></h2>
[setupcd]
<h3>Fix #1: Replace MPR.dll</h3>
[setupcd]

[partial name="partial_restorefile_xp" file="mpr.dll" command="expand D:\\i386\\mpr.dl_ C:\\Windows\\system32\\"]

Here is an example of what the PC's console output should look like once the MPR.dll file is properly restored:

[caption id="attachment_4303" align="alignnone" width="720"]<a href="https://neosmart.net/blog/wp-content/uploads/sites/5/2016/06/MPR.dll-restored.png"><img class="wp-image-4303 size-full" src="https://neosmart.net/blog/wp-content/uploads/sites/5/2016/06/MPR.dll-restored.png" alt="MPR.dll restored from Win XP install CD" width="720" height="396" /></a> MPR.dll restored from Win XP install CD[/caption]
<h3>Fix #2: Repair corrupted system files with the SFC command</h3>
On Windows Vista and Windows 7, it is possible to use the built-in Windows SFC(system file checker) tool to automatically scan a computer's system files and repair them if necessary.

Here are the steps to run SFC:
<ol>
 	<li>Boot from your Windows install disc</li>
 	<li>Click on <strong>Repair your co</strong><strong>mputer</strong> after selecting proper language, time and keyboard input.</li>
 	<li>Select the Windows installation drive, which is usually <code>C:\</code>, and click <strong>Next</strong></li>
 	<li>Choose Command Prompt when the System Recovery Options box appears</li>
 	<li>Write the following command and press <kbd>Enter</kbd> afterwards:
<pre>sfc /scannow /offbootdir=D:\ /offwindir=D:\Windows\</pre>
Replace D: with the letter of the driver where Windows is installed, and D:\Windows with the Windows folder location.</li>
</ol>
Here is an example of what the PC's console output should look like once the sfc.exe scan is complete and missing files are successfully restored:

[caption id="attachment_4233" align="alignnone" width="800"]<a href="https://neosmart.net/blog/wp-content/uploads/sites/5/2013/08/sfc_result.png"><img class="wp-image-4233 size-full" src="https://neosmart.net/blog/wp-content/uploads/sites/5/2013/08/sfc_result.png" alt="MPR.dll restored by the SFC utility" width="800" height="600" /></a> MPR.dll restored by the SFC utility[/caption]
<h3>Fix #3: Check the hard drive with CHKDSK utility</h3>
If the hard drive has its file integrity compromised, it is possible to use built-in Windows CHKDSK utility to scan the disk and fix the file system errors.

Here are the steps to run CHKDSK:
<ol>
 	<li>Boot from your Windows install disc</li>
 	<li>Click on <strong>Repair your co</strong><strong>mputer</strong> after selecting proper language, time and keyboard input.</li>
 	<li>Select the Windows installation drive, which is usually <code>C:\</code>, and click <strong>Next</strong></li>
 	<li>Choose Command Prompt when the System Recovery Options box appears</li>
 	<li>Write the following command and press <kbd>Enter</kbd> afterwards:
<pre>chkdsk C: /f</pre>
Replace C: with the letter of the driver where Windows is installed.</li>
</ol>
Here is an example of what the PC's console output should look like once the chkdsk.exe is complete:

[caption id="attachment_3697" align="alignnone" width="800"]<a href="https://neosmart.net/blog/wp-content/uploads/sites/5/2016/04/VirtualBox_Win7_clean_21_04_2016_03_58_48.png"><img class="wp-image-3697 size-full" src="https://neosmart.net/blog/wp-content/uploads/sites/5/2016/04/VirtualBox_Win7_clean_21_04_2016_03_58_48.png" alt="Chkdsk utility results screen" width="800" height="600" /></a> Chkdsk utility results screen[/caption]
<h2>More Information</h2>
<h3>Linked Entries</h3>
<ul>
 	<li><a href="https://neosmart.net/wiki/chkdsk/">chkdsk</a></li>
</ul>
[partial name="partial_moreinfo" versions="xp,vista,7,8,10"]