Hi, Have a really annoyingsituation with a non starting firefox. Currently trying on release 16.0, but had the same issue from version 15 approximately. Diagnostics: - Windows 7 Pro x64 - Fresh install, cleaned every trace of firefox out of the computer before reinstalling - At some point it worked with the "launch firefox" in the install wizard, but if I closed it I couldn't start it again. Now it does not work anymore that way. - Firefox starts no problem when run as administrator - When the install wizard shows up, it asks admin rights, if I grant it it does not launch afterwards, if I don't grant it and install firefox in a non-admin folder, it does not launch either. - Non-admin, Safe mode doesn't start - Non-admin, Profile manager doesn't start - At some point I had the profile-manager or import wizard showing up when launching as non admin, but they were "non responding". Not reliably replicated. - Doesn't start means the process is started (seen in task manager though the RAM usage is not moving), but no window opens. - No firewall software, windows firewall disabled - Apparently it's crashing, because in the profile/minidumps folder, there is a 0kb file created at the moment I try to start it - If I start with no profile folders, it will create one but it's missing the Cache folder, the mozilla-media-cache folder, the startupCache folder, content-prefs.sqlite, formhistory.sqlite, mimeTypes.rdf, pluginreg.dat, sessionstore.js, signons.sqlite, urlclassifier*, webappstore.sqlite - If I copy the "working" (created in admin) profile folder, paste it in the non-admin default folder, it doesn't start, and the only files that are modified in the profile folder are compatibility.ini and places.sqlite*