New submission from Roger Cook:

The Windows installer stops the installation and backs out on a clean system. 
Here is the relevant section of the log file (msiexec /i 
python-2.7.11.amd64.msi /l*v):

MSI (s) (14:90) [15:13:32:577]: Executing op: ActionStart(Name=RemovePip,,)
Action 15:13:32: RemovePip. 
MSI (s) (14:90) [15:13:32:578]: Executing op: 
CustomActionSchedule(Action=RemovePip,ActionType=3090,Source=C:\Python27\python.exe,Target=-B
 -m ensurepip._uninstall,)
MSI (s) (14:90) [15:13:32:579]: Note: 1: 1721 2: RemovePip 3: 
C:\Python27\python.exe 4: -B -m ensurepip._uninstall 
MSI (s) (14:90) [15:13:32:579]: Note: 1: 2262 2: Error 3: -2147287038 
Error 1721. There is a problem with this Windows Installer package. A program 
required for this install to complete could not be run. Contact your support 
personnel or package vendor. Action: RemovePip, location: 
C:\Python27\python.exe, command: -B -m ensurepip._uninstall 
MSI (s) (14:90) [15:13:37:027]: Note: 1: 2262 2: Error 3: -2147287038 
MSI (s) (14:90) [15:13:37:027]: Product: Python 2.7.10 (64-bit) -- Error 1721. 
There is a problem with this Windows Installer package. A program required for 
this install to complete could not be run. Contact your support personnel or 
package vendor. Action: RemovePip, location: C:\Python27\python.exe, command: 
-B -m ensurepip._uninstall 

Action ended 15:13:37: InstallFinalize. Return value 3.

--- end log ---

It appears that the installer tries to call the Python executable before it has 
been put in place. This fails, and the installer backs out.

Workaround: Install 2.7.10, then install 2.7.11 over it.

----------
components: Installation
messages: 258836
nosy: Roger Cook
priority: normal
severity: normal
status: open
title: 2.7.11 won't clean install on Windows 10 x64
type: behavior
versions: Python 2.7

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26183>
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