Why can't i download adobe reader  on my windows vista. Error message is invalid key

I can not download Adobe reader. The installation begins, but then I get the message that the key is invalid. I don't know what means or how to correct it. How can I get a vaid key.

That is a problem caused by Microsoft or one of their recent updates.  Here is the solution
in the Windows Explorer address bar type %APPDATA%
on the right-hand side double-click on the Microsoft folder
now look for a folder named Crypto; delete it, or rename it to something like Crypto-old
If you need more detailed help, tell us your Windows version.

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