This seems like a connectivity issue, R is not being able to connect to the CRAN repository you have selected, these are some things to try.
- Choose a different CRAN repository, RStudios repository is a good choice (http://cran.rstudio.com/) or you could choose one that is geographically closer to you.
- Disable secure download setting.
- Check if your internet connection has traffic restrictions of some kind, like a firewall, proxy server, etc. This is usually the case when you are at work or school.
Also, you are missing the needed software to compile R packages on Windows, i.e. Rtools, you can download it from here
https://cran.r-project.org/bin/windows/Rtools/
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