https://community.hpe.com/t5/servers-general/fixing-python-installation-error-0x80070659-on-windows-server/m-p/7256752#M21695 <P><STRONG>Struggling to install Python on Windows? You’re not alone.</STRONG></P><P>If you’ve run into the <STRONG>0x80070659 error</STRONG> while installing Python it usually means the Windows Installer is being blocked by a system policy. This can happen because of Group Policy restrictions, registry settings, or security configurations that prevent software installations.</P><P>Python is everywhere these days — powering automation, AI and ML projects, DevOps workflows, and data pipelines. This error can completely stop your setup and prevent you from running any of your accelerator or automation solutions. Getting past this installer block is essential to set up Python smoothly and keep your workflows running without interruptions.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Python installation failed with error code 0x80070659 — blocked by Windows Installer policy." style="width: 976px;"><img src="https://community.hpe.com/t5/image/serverpage/image-id/152284i2AE41FCD3FCAF600/image-size/large?v=v2&amp;px=2000" role="button" title="python_error_code.png" alt="Python installation failed with error code 0x80070659 — blocked by Windows Installer policy." /><span class="lia-inline-image-caption" onclick="event.preventDefault();">Python installation failed with error code 0x80070659 — blocked by Windows Installer policy.</span></span></P><HR /><P><STRONG>Root Cause</STRONG></P><P>The error happens when the registry key controlling MSI installations restricts or disables installer execution. This prevents the Python MSI installer from running successfully.</P><HR /><P><STRONG>Step-by-Step Resolution</STRONG></P><P><STRONG>1. Re-register the Windows Installer</STRONG><BR />This refreshes the Windows Installer service and resolves corruption issues. Run these commands in an elevated Command Prompt (Run as Administrator):</P><PRE><SPAN>msiexec /unregister msiexec /regserver</SPAN></PRE><P>Restart your system after running the commands.</P><HR /><P><STRONG>2. Modify the Registry Policy</STRONG><BR />Ensure MSI installations are not disabled in the registry:</P><OL><LI><P>Press <STRONG>Win + R</STRONG>, type regedit, and press <STRONG>Enter</STRONG>.</P></LI><LI><P>Navigate to:&nbsp;HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Installer</P></LI><LI><P>Locate or create a <STRONG>DWORD (32-bit)</STRONG> value named DisableMSI.</P></LI><LI><P>Set its value to <STRONG>0</STRONG>.</P></LI><LI><P>Restart your PC.</P></LI></OL><HR /><P><STRONG>Result</STRONG></P><P>After these steps, the Python installer should run without any policy-related blocks. Re-registering the Windows Installer and updating the registry value resolved the error completely.<BR /><BR /></P> Thu, 09 Oct 2025 05:04:26 GMT yashwanth_k 2025-10-09T05:04:26Z https://community.hpe.com/t5/servers-general/fixing-python-installation-error-0x80070659-on-windows-server/m-p/7256752#M21695 <P><STRONG>Struggling to install Python on Windows? You’re not alone.</STRONG></P><P>If you’ve run into the <STRONG>0x80070659 error</STRONG> while installing Python it usually means the Windows Installer is being blocked by a system policy. This can happen because of Group Policy restrictions, registry settings, or security configurations that prevent software installations.</P><P>Python is everywhere these days — powering automation, AI and ML projects, DevOps workflows, and data pipelines. This error can completely stop your setup and prevent you from running any of your accelerator or automation solutions. Getting past this installer block is essential to set up Python smoothly and keep your workflows running without interruptions.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Python installation failed with error code 0x80070659 — blocked by Windows Installer policy." style="width: 976px;"><img src="https://community.hpe.com/t5/image/serverpage/image-id/152284i2AE41FCD3FCAF600/image-size/large?v=v2&amp;px=2000" role="button" title="python_error_code.png" alt="Python installation failed with error code 0x80070659 — blocked by Windows Installer policy." /><span class="lia-inline-image-caption" onclick="event.preventDefault();">Python installation failed with error code 0x80070659 — blocked by Windows Installer policy.</span></span></P><HR /><P><STRONG>Root Cause</STRONG></P><P>The error happens when the registry key controlling MSI installations restricts or disables installer execution. This prevents the Python MSI installer from running successfully.</P><HR /><P><STRONG>Step-by-Step Resolution</STRONG></P><P><STRONG>1. Re-register the Windows Installer</STRONG><BR />This refreshes the Windows Installer service and resolves corruption issues. Run these commands in an elevated Command Prompt (Run as Administrator):</P><PRE><SPAN>msiexec /unregister msiexec /regserver</SPAN></PRE><P>Restart your system after running the commands.</P><HR /><P><STRONG>2. Modify the Registry Policy</STRONG><BR />Ensure MSI installations are not disabled in the registry:</P><OL><LI><P>Press <STRONG>Win + R</STRONG>, type regedit, and press <STRONG>Enter</STRONG>.</P></LI><LI><P>Navigate to:&nbsp;HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Installer</P></LI><LI><P>Locate or create a <STRONG>DWORD (32-bit)</STRONG> value named DisableMSI.</P></LI><LI><P>Set its value to <STRONG>0</STRONG>.</P></LI><LI><P>Restart your PC.</P></LI></OL><HR /><P><STRONG>Result</STRONG></P><P>After these steps, the Python installer should run without any policy-related blocks. Re-registering the Windows Installer and updating the registry value resolved the error completely.<BR /><BR /></P> Thu, 09 Oct 2025 05:04:26 GMT https://community.hpe.com/t5/servers-general/fixing-python-installation-error-0x80070659-on-windows-server/m-p/7256752#M21695 yashwanth_k 2025-10-09T05:04:26Z https://community.hpe.com/t5/servers-general/fixing-python-installation-error-0x80070659-on-windows-server/m-p/7256753#M21696 <P>very useful article on fixing Python installation error</P> Wed, 08 Oct 2025 09:29:36 GMT https://community.hpe.com/t5/servers-general/fixing-python-installation-error-0x80070659-on-windows-server/m-p/7256753#M21696 pearlwilson 2025-10-08T09:29:36Z