Instalation failed

Hi,
After restart, checking rights, etc. I still get this error

I have googled it, but found no solution. Any help ?
After restart, checking rights, etc. I still get this error

I have googled it, but found no solution. Any help ?
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Answers
Are you installing into the default location?
From the error I think it try to create a folder in C:\Windows\Downloaded Installations, does the user have permissions on this folder?