Error shown from the second time of installing LCPD

Hey all, The first time I installed this, everything was alright and it went in the EFLC folder, fine. I have checked the help files, but can't find anything relevant. I get the following message when installing:
Microsoft.NET Framework
Unhandled exception has occurred in a component in your application. If you click
Continue. the application will ignore this error and attempt to continue. If
you click Quit. the application will close immediately Problem negotiating with G17 Media.
How can I solve this?
Waiting for your suggestions.
Thanks to all.
