我的R软件下载安装包出现了以下问题，以下载reshape2为例（其他的包也会出现类似的情况），R语言编辑框中出现了以下语句：
> install.packages("reshape2")
trying URL 'http://mirror.bjtu.edu.cn/cran/bin/windows/contrib/3.1/reshape2_1.4.1.zip'
Content type 'application/zip' length 503565 bytes (491 KB)
opened URL
downloaded 491 KB

package ‘reshape2’ successfully unpacked and MD5 sums checked
Warning in install.packages :
  unable to move temporary installation ‘D:\Program Files\R\R-3.1.3\library\file16a84f1f320b\reshape2’ to ‘D:\Program Files\R\R-3.1.3\library\reshape2’

The downloaded binary packages are in
        C:\Users\Administrator\AppData\Local\Temp\RtmpaOyzIy\downloaded_packages
> library(reshape2)
Error in library(reshape2) : 不存在叫‘reshape2’这个名字的程辑包
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