I've seen this many times on our little AOD270. Occasionally something just won't startup correctly, and comes up with the "xyz has stopped working" message. To be honest, e-power tray doesn't seem that important. I'm sure you could find it's .exe in the C:\program files\acer\acer power management\ or similar folder.
It takes a special kind of person to lead! We all know this. Over the past 3 years or more, visitors to Acer Community were witness to a leader in our Top Ranked ACE member, IronFly. Recently he hit a new milestone of 1000 solutions authored. Leading the way has always been and continues to be his way. We are proud of you IronFly.