Hello, I have never had to resort to using a forum to solve a windows OS related problem but after several hours this has truly stumped me. I was messing around with the uninstall a program feature and may have gotten a little overzealous as it seemed I uninstalled the windows installer. Almost every program won't open now including MS office, 3DS Max, IE, firefox, etc. Office programs fail throwing Error 1719: The Windows Installer Service could not be accessed. Several programs simply do nothing when ran for example IE. Firefox freezes up as soon as it tries to load any tabs. Many program suggest they just aren't installed at all when I try to run them. When I try to go control panel -> programs and features and hit the uninstall a program link nothing happens. One main issue that I am running into is people keep suggesting cleanup utilities but I can't install anything new at all so they just fail. Some programs still work though! Visual Studio C# 2010 still works fine along with a couple ftp programs and Opera (which is how I was able to post this post). I have tried installing random things like notepad++, reinstalling Firefox, etc but they all fail with Opera throwing the error "Error when initializing the file dialog: 0xFFFF Internal program error." before the installer can even start. I have tried every single trick in these forums and several others I lost track of... http://support.microsoft.com/kb/315353 http://en.kioskea.net/forum/affich-390-windows-installer-service-could-not-be-access I would like to note that reinstalling windows is essentially not an option and I don't even have the windows 7 install disc (away from my house for a couple of weeks). Also, no restore points available. Any help appreciated, thanks.