Hi, I installed biOps on my XP, and installed the required dll packages, jpeg62.dll, libfftw3-3.dll, and libtiff3.dll, as suggested. Then it worked perfectly for about one week till this afternoon. When I tried to load biOps again, I got the following error message again Error in inDL(x, as.logical(local), as.logical(now), ...) : unable to load shared library 'C:/PROGRA~1/R/R-29~1.0/library/biOps/libs/biOps.dll': LoadLibrary failure: The specified module could not be found. Error: package/namespace load failed for 'biOps' I saw the same error message before I installded the above three dll files. Then I checked the dll files, they are still there. I checked the PATH, and the PATH includes the path to the folder where I put the dll files. It's very amazing to me, since biOps worked on the same computer for about one week till this afternoon. Then I tried to install biOps on my another laptop with the three dll files installed, and biOpst does not work on my laptop this time. Does any of you have any idea or suggestions? I even re-downloaded the three dll files from the websites in case the three I have were contaminated somehow. Any help if greatly appreciated! Michelle -- View this message in context: http://www.nabble.com/biOps-load-failed-tp24084987p24084987.html Sent from the R help mailing list archive at Nabble.com.