I'm also having a problem upgrading to the new limewire. The upgrade-install starts going through till it reaches the uninstalling old version, then it comes up with a "missing \TEMP\_is2F\limewire.msi file, can't uninstall old version of limewire. Please contact support" message. The new install ends. I get this same message if I try under add/remove in the control panel to actually uninstall the old before running the new install. I'm running Limewire version 2.5.3, Windows XP. Any help anyone can give would be appreciated.