Problem with dual boot windows 7 and centos 5.

[kdminhquan]

Dear all ,
i have an issue about dual boot between win 7 and centos 5.
i have a PC with installed windows 7.
then i install centos 5 netinstall via usb ( using yumi application to make usb boot )
after going into centos installation. i choose dual boot option with Centos (sdc) and the installation is successful. may thuy binh , thuoc do laser
but after restarting and removing usb , my PC only boot into windows 7 with out choosing notice.
i put usb again into Pc and restart PC. it show the boot option but only centos and now i can go into centos.
i search internet and run easyBCD on win 7 but not successful.
anyone can tell me the way to create the boot option when i turn on the PC
thanks so much

[TrevorH]

You installed grub on the USB stick and not on the hard disk. It's an option during the install.

[kdminhquan]

You installed grub on the USB stick and not on the hard disk. It's an option during the install.

thanks for your advice.
it seem a centos key but now im installing another centos version and having a problem.
This version in this topic is netinstall and the version which im installing is full server. intall via hard disk