Seems there are some minor install problems with the latest version of AdWords Editor.
There was one discussed on the forum here. And Google gave some information about what they had been seeing.
"The potential exists for v5 on Windows to crash on start-up. This will most likely be experienced by users who have Google Toolbar for Internet Explorer. The work-around for this is to remove all copies of Google AdWords Editor from the Add or Remove Programs Control Panel (there will probably be two), then reinstall," Google suggested.
Upcoming Webinar: PPC Pause and Reflections for 2013
Thursday, December 12 - 2013 was a major turning point in search advertising. With Google's Enhanced Campaigns and Bing's innovative Smart Search capabilities in Windows 8.1, now is a great time to pause, reflect, and plan for the new year. Webinar attendance is free. Sign up today!