library(xlsx) fails with an error: Error: package ‘rJava’ could not be loaded

Windows 7 64-bit
R 3.1.3
RStudio 0.98.1103


I am having difficulty loading and installing the xlsx package. The
loading occurred without any problem, however the library command
library(xlsx) produced an error related to rJava. I tried to install
rJava seperately, re-loaded the xlsx package, and entered the
library(xlsx) command but received the same error message about rJave.
Please see terminal messages below. Any suggestion that would allow me
to load and run xlsx would be appreciated.
Thank you,
John

install.packages("xlsx")

Installing package into ?C:/Users/John/Documents/R/win-library/3.1?
(as ?lib? is unspecified)
trying URL
'http://cran.rstudio.com/bin/windows/contrib/3.1/xlsx_0.5.7.zip'
Content type 'application/zip' length 400944 bytes (391 KB)
opened URL
downloaded 391 KB


package ?xlsx? successfully unpacked and MD5 sums checked


The downloaded binary packages are in
        C:\Users\John\AppData\Local\Temp\Rtmp4CO5m7\downloaded_packages

library(xlsx)

Loading required package: rJava
Error : .onLoad failed in loadNamespace() for 'rJava', details:
  call: inDL(x, as.logical(local), as.logical(now), ...)
  error: unable to load shared object
'C:/Users/John/Documents/R/win-library/3.1/rJava/libs/x64/rJava.dll':
  LoadLibrary failure:  The specified module could not be found.


Error: package ?rJava? could not be loaded

install.packages("rJava")

Installing package into ?C:/Users/John/Documents/R/win-library/3.1?
(as ?lib? is unspecified)
trying URL
'http://cran.rstudio.com/bin/windows/contrib/3.1/rJava_0.9-6.zip'
Content type 'application/zip' length 759396 bytes (741 KB)
opened URL
downloaded 741 KB


package ?rJava? successfully unpacked and MD5 sums checked


The downloaded binary packages are in
        C:\Users\John\AppData\Local\Temp\Rtmp4CO5m7\downloaded_packages

library(rJava)

Error : .onLoad failed in loadNamespace() for 'rJava', details:
  call: inDL(x, as.logical(local), as.logical(now), ...)
  error: unable to load shared object
'C:/Users/John/Documents/R/win-library/3.1/rJava/libs/x64/rJava.dll':
  LoadLibrary failure:  The specified module could not be found.


Error: package or namespace load failed for ?rJava?

library(xlsx)

Loading required package: rJava
Error : .onLoad failed in loadNamespace() for 'rJava', details:
  call: inDL(x, as.logical(local), as.logical(now), ...)
  error: unable to load shared object
'C:/Users/John/Documents/R/win-library/3.1/rJava/libs/x64/rJava.dll':
  LoadLibrary failure:  The specified module could not be found.


Error: package ?rJava? could not be loaded


John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and
Geriatric Medicine
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)


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