hi
early, i installed my windows 8 then i install bitdefender windows 8 security. after get a windows update, three messages shown in windows action center(below image):

when i choose one of this three options a new message open and ask me to:
- Turn on Windows Defender
-Turn on and update Bitdefender [Antispyware, Antivirus, Firewall]
why windows don't automatically choose the Bitdefender as default security suit?