Dual boot with windows 8

Hello, I just installed Fedora 19 with the regular partition settings :
Data :
swap : 5.9Gb

System :
sda7 /Boot 500Mb ext4
sda2 /Boot/efi 200Mb EFI system partition
root / 13.59Gb ext4

The problem it that when I start my laptop (HP envy M6) it automaticly goes on windows without asking if I want to use Fedora or windows...

Can you help me and tell me what I did wrong or what should I do to fix that ?
thanks :D
(First time I try Fedora)