Installing Problems - 'Key not valid for use in specified state.'

[Michael Torrie]

On 08/22/2014 05:51 AM, FreddieH wrote:
> I am having trouble installing Python on my Windows 7 (x64) Laptop.
> The MSI file for Python 3.4.1 that I have downloaded got to the set up page containing 'Please wait while the Installer installs Python 3.4.1' and asks for administrator permission to continue the installation.
> After I give administrator permission to continue with the install, it gives me the error pop up 'Key not valid for use in specified state.'
> After some googling I can see that this is a problem with some installer packages but I have not yet found a solution to this problem. In addition to the googling, I talked to the people on the Windows IRC channel at freenode [webchat.freenode.net/?channels=windows] but they too were unable to find a problem . They said that the installer package was corrupted and that I should contact support.
> I have also tried using other versions python installers but they return the same error.

The problem isn't with the installer, but with Windows.  A quick google
search reveals that deleting (rename for backup purposes) the following
directory should help:

C:\Users\xxx\AppData\Roaming\Microsoft\Crypto\RSA

I usually would rename it to something like RSA.corrupted.  Then after
things were working again, I'd delete it.