When trying to install 4.2.6 in Windows 8 I get error message internal error 2503 then message internal error 2502 then installation halts. What should I do?

new user. never installed Libre before. New PC with Webroot security software and Microsoft office 13 installed. I unplugged internet cable and turned off Webroot security software. When I ran install still got errors 2503 and 2502.

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