No, those are the things the program deletes, but also select all of the ati options in the drop down menu. After you do this, make sure you restart your pc, and then install the ATI Catalyst Drivers.
Great, so just wait until it is done, and then restart.
EDIT: CHECK PAGE 3
Yes, all of ATI's stuff must be deleted prior to new driver installation.
EDIT: Now restart, and install the newest ATI CATALYST drivers.