I was having problems with the autodesk revit software when I was using it. I was constantly getting error messages that would close the window that I was working on and I would also get fatal error messages that would close the program. I reinstalled it and repaired it but the problem was still occurring. I uninstalled the program, downloaded it again from the autodesk website and installed it as I did prior. Everything went fine, I registered the program typed in my serial number and it said that the installation was successful. I then tried to open the program but it wouldn't let me. The start up window appears but nothing happens after that. The program becomes unresponsive. I tried to uninstall it again but it does not let me.