An error has occurred creating the configuration section handler for userSettings/Microsoft.SqlServer.Configuration.LandingPage.Properties.Settings: Could not load file or assembly 'System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The System cannot find the file specified. (C:UsersBillyAppDataLocalMicrosoft_CorporationLandingPage.exe_StrongName_ryspccglaxmt4nhllj5z3thcyltsvyyx10.0.0.0user.config line
If you are running Windows 7, read on.
Whilst I'm fully aware that this answer is around a year too late, I thought it might be useful for someone.
Assuming you've already:
Step 1: Download
and install Microsoft
.Net Framework 3.5 SP1.
Step 2: Download
and install Windows
Installer 4.5.
and it hasn't worked (It didn't for me, or most others with this problem), do the following:
Delete the "C:Users{Username}AppDataLocalMicrosoft_Corporation" folder (Replace {Username} with Billy in the original posters case)
No idea why, but it works.
And yes - This IS a serious solution :-)