Answer to Question one:
You can goto CP>Member Management>Advanced Search Options
Select Member is banned? Yes
Select submit at the bottom of the page.
At the bottom of the page you have a action field. Select "Delete"
Then select "All Members or Selected Members?"
Then Choose "All Members in Search"
The select "Perform selected Action"

Question 2? Not sure what you mean.

Blue Man Group
There is no such thing as stupid questions. Just stupid answers