Add "C:\Program Files\R\R-3.1.1\bin\i386" to the SYSTEM path. Restart IIS or IIS express so that the path changes can be seen by the process. That will fix your issue under IIS.
FWIW, there is a R_HOME but no RHOME or RPATH. Neither one fixes the issue mention in this bug, or others. You need to add the bin folder to the system path.
FWIW, there is a R_HOME but no RHOME or RPATH. Neither one fixes the issue mention in this bug, or others. You need to add the bin folder to the system path.