Do you ever read your logs to see what they say and try and work it out for yourself?
Last few lines of your log:
111011 17:47:38 INFO 'trying external plugin directory : C:\\BigBrotherBot\\extplugins'
111011 17:47:38 CRITICAL 'Error loading plugin: No module named Poweradmin'
Traceback (most recent call last):
File "b3\parser.pyo", line 591, in loadPlugins
File "b3\parser.pyo", line 702, in pluginImport
ImportError: No module named Poweradmin
So it can't find your poweradmin.py file, make sure that it is in the extplugins folder.