I have windows vista, and despite of the new version (3.2.27.0) it does not work.
Waiting for a solution.
Service 'Garmin Core Update Service' (Garmin Core Update Service) could not be installed. Verify that you have sufficient privileges to install system services.
This install is an absolute joke, I have tried this and many other work arounds to try and install this software.. so very frustrated at this point I can not even express my opinion of this install and software. Someone fix this issue PLEASE! .
I am sorry that you you are having trouble installing Garmin Express.
FORESTPLAY
To resolve issues with the .NET Framework, download and run Microsoft's .NET Framework Repair Tool:
http://www.microsoft.com/en-us/download/details.aspx?id=30135