Just saw this
Microsoft .NET Framework Repair Tool
and thought it might be useful with those having BC install and/or run issues (BC is .NET based on Windows).
BaseCamp worked fin for several month but suddenly did not start any more. The following error message was displayed:"There is a problem with the Microsoft .NET installation. Please uninstall and reinstall all versions of the Microsoft .NET Framework."
Uninstalling and reinstalling of .NET did not solve the issue.
Further investigation showed, that the following file was corrupt or damaged:
Folder: C:\Users\***\AppData\Local\GARMIN_Corp\BaseCamp.exe_Url_bzc2***\4.2.5.0
File Name: "user.config"
Damage Type: The file was 32 kB but was completely empty but should contain XML code.
The solution:
1. Delete the file "user.config" in the above mentioned folder
2. Start BaseCamp
3. A new file "user.config" is generated by BaseCamp while BaseCamp starts