Firefox, Internet Explorer & WinSCP

I have just installed WinSCP and tried typing a URL beginning with SCP in Firefox. WinSCP briefly launches, displays an 'Invalid Access to Memory' error and then dies. IE gives me the same error.

If I launch it manually it works ok.

Note I have not rebooted, and I don't want to have to any time soon.

Do you use 3.8? Can you try 3.7.6?