[R] Problem installing packages on Windows

[John Field]

I've recently had a series of similar errors trying to install 
packages to R 2.1.1 running under Windows XP.

 > utils:::menuInstallLocal()
package 'randomForest' successfully unpacked and MD5 sums checked
updating HTML package descriptions
Warning message:
unable to move temporary installation 'C:\Program 
Files\R\rw2011\library\file25214\randomForest' to 
'C:\PROGRA~1\R\rw2011\library\randomForest'
 >

I get the same error if I try directly installing from CRAN or from a 
local zip file.

I've fixed it for some earlier package downloads by reinstalling R 
and packages, but I don't want to have to do that every time.

Any ideas about what the problem is?

Many thanks,
John Field

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