[R] problems with rJava

[R Heberto Ghezzo, Dr]

Hello, using r-2.12.0 on a Toshiba laptop with Win7
I am trying to install JGR, iut installs OK but when loading, complains about rJava
so I did:
> install.packages("rJava")
Installing package(s) into ‘I:\R\cran’
(as ‘lib’ is unspecified)
trying URL 'http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/2.12/rJava_0.8-8.zip'
Content type 'application/zip' length 636680 bytes (621 Kb)
opened URL
downloaded 621 Kb

The downloaded packages are in
        C:\Users\Heberto\AppData\Local\Temp\Rtmpyd0JHa\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 'I:/R/cran/rJava/libs/i386/rJava.dll':
  LoadLibrary failure:  The device is not ready.

Error: package/namespace load failed for 'rJava'
> 
rJava.dll is in that place. Is it a problem witm Win7? 
Thanks

R.Heberto Ghezzo Ph.D.
Montreal - Canada