[R] Installing Packages

[HAJJI OUAFI SAAD]

Hello,
I am working with R.1.5.1 in Windows. When trying to
install packages directly from then menu 'packages', I
have got the error, 

Error in download.file(url = paste(contriburl,
"PACKAGES", sep = "/"),  : 
        cannot open URL
`http://cran.r-project.org/bin/windows/contrib/PACKAGES'

Thank you for your help

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