Hello I had the same problem today.
Error Message: "This Installation can only be uninstalled on 64-bit Windows." Computer System: Windows 7 Enterprise SP1 32-bit R Version attempted: R 2.13.1 (installed as part of the R and Friends package from http://rcom.univie.ac.at/download.html) I have R 2.12.0 successfully running on another machine using Windows 7 64-bit. The reason I tried to uninstall is because the installation hanged at a certain point. I went down the basic path of R installation only. Since installation was unsuccessful, I logged off and tried again a few times. Then, when I tried to uninstall, the software gave an error message. I believe version 2.13.1 for Windows was packaged incorrectly, thus causing both installation and uninstallation problems. It is possible to uninstall manually. If someone knows of a fix to this installation or uninstallation problem, please post to this thread (which might help other people who have the same problem). My resolution will be to drop back to an earlier version of R, and then wait for another future version beyond 2.13.1 -- sad that this particular build has some flaws ----- Mark Tabladillo Data Mining Architect Microsoft MVP; SAS Developer http://www.marktab.net -- View this message in context: http://r.789695.n4.nabble.com/trouble-with-uninstall-tp3694855p3725426.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.