<p><a href="http://wincert.net/wp-content/uploads/2015/01/windows-server2.jpg"><img class="alignnone size-full wp-image-551" src="http://wincert.net/wp-content/uploads/2015/01/windows-server2.jpg" alt="Windows Server,access,permission,ipsec fails,printers offline,printer installation,trusted sites,item" width="720" height="340" /></a></p>
<p>If you try to install SQL Server Express you may receive the following error message:<br />
Installation file missing: WindowsInstaller-KB893803-v2-x86.exe SQL Server Express installation failed.</p>
<p>You may also have issues with installation of any other applications, because of installation file missing error.</p>
<p>This problem is related to MSI Installer not working properly.</p>
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<p>To solve this please do the following:</p>
<ol style="box-sizing: border-box; position: inherit;">
<li>Log on to your computer as an administrator.</li>
<li>Click Start, and then click Run.</li>
<li>In the Open box, type cmd, and then click OK.</li>
<li>At the command prompt, type msiexec.exe /unregister, and then press ENTER.</li>
<li>Type msiexec /regserver, and then press ENTER.</li>
<li style="box-sizing: border-box; position: inherit;">Verify that the SYSTEM account has full control access permissions to the <span style="color: #003366;">HKEY_CLASSES_ROOT</span> hive in the Windows registry. In some cases, you may also have to add Administrator accounts.</li>
</ol>
<div>Comments are welcome!</div>