R is a free statistical software.
Choose “Download R for Windows”.
You will reach on a webpage as in the following picture. Choose “base” link from this page.
Download the latest version of R executable file and open by double clicking.
Run in Windows to install it in your system.
It may ask later whether to install 32 bit or 64 bit version depending upon the Windows version you have installed in your computer. Usually 64 bit Windows are faster than 32 bit.
Once installation is done, you will the R icon in the desktop or in the program folder. Double click on this R icon to start working.