R installation in a multiple-user Windows environment

We're having some issues with installing R in a multiple user Windows 
environment (e.g. when a user installs a package, there are errors 
linked to attempting to install certain files into restricted 
directories).  Is there a readme for how to install R properly for 
multiple users?  Thanks!

--j

Jonathan A. Greenberg, PhD
Postdoctoral Scholar
Center for Spatial Technologies and Remote Sensing (CSTARS)
University of California, Davis
One Shields Avenue
The Barn, Room 250N
Davis, CA 95616
Cell: 415-794-5043
AIM: jgrn307, MSN: jgrn307 at hotmail.com, Gchat: jgrn307