How to Uninstall R and All Its Packages on Windows
Unlike most other software, uninstalling R does not remove it completely. Section 2.7 of R for Windows FAQ states that uninstallation of R only removes files from the original installation, not the packages and other subsequently installed files. This article shows how to uninstall R and all its packages on Windows. Paths to R Package Libraries R packages are installed in folders that R calls libraries. In most cases, there may be more than one library folder.