Ok I want to explain my situation. I had .NET 4.5 framework installed on my computer but have applications built with Visual Studio .NET using 4.0 framework. I tried to install a 3rd party tool to use within my applications but it requires a 4.0 install. So, I got the .NET 4.0 install and now I am all messed up. I uninstalled 4.5 and installed 4.0 and now I cannot open Visual Studio. When I reboot I get error messages for TFS and another message from MOM.exe and it says I must have 4.5 installed so after not clicking yes I eventually did but to no avail. I am looking to get the .NET 4.0 framework installed so I can move forward. Does anyone have any tips or tricks to get this to work ?