Whatever you do, don't use "Run As Administrator" to install R unless you know 
exactly why and how you plan to fix the resulting mess. 

It is normal not to be able to update the library under Program Files. It is 
not normal (in my experience) to have problems creating the library under your 
Documents directory. 

One thing that looks odd with your error message is the presence of slashes 
going  backward (\) as Windows likes and forward (/) as Mac/Linux prefer. Since 
strings in R use backslash as an escape character, this can sometimes indicate 
failure to specify the path correctly, but not always. Forward slashes for 
directory separators usually work within R even on Windows, which means you 
don't need to escape the backslash ("\\")... but this is a sample of output 
rather than input so might be just fine. 

Alternatively, you may be missing one of

C:/Users/Alejandro/
C:/Users/Alejandro/Documents/

or the permissions on 

C:/Users/Alejandro/Documents/R/

might be preventing R from modifying it. 

-- 
Sent from my phone. Please excuse my brevity.

On June 21, 2017 1:30:06 PM PDT, Alejandro Cayetano Casella 
<alejandrocasell...@gmail.com> wrote:
>Hi, I want to download the packages into R in my personal computer  and
>this is what appears on the screen:
>> utils:::menuInstallPkgs()
>Warning in install.packages(NULL, .libPaths()[1L], dependencies = NA,
>type
>= type) :
>  'lib = "C:/Program Files/R/R-3.4.0/library"' is not writable
>Error in install.packages(NULL, .libPaths()[1L], dependencies = NA,
>type =
>type) :
>  unable to create ‘C:\Users\Alejandro\Documents/R/win-library/3.4’
>In addition: Warning message:
>In dir.create(userdir, recursive = TRUE) :
> cannot create dir 'C:\Users\Alejandro\Documents\R\win-library', reason
>'No such file or directory'
>
>Can you help me?
>Thank you.
>
>       [[alternative HTML version deleted]]
>
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