Please help on boot issue....

i am new user of the opensuse 11.1
yesterday i encounter a problem. When i start my laptop it starts without giving me option to choose the operating system.I have installed opensuse11.1 and windows 7 RC on my system.It start with windows7 as default os.plz help

Here is some reading for you which may help: HowTo Boot into openSUSE when it won’t Boot from the Grub Code on the Hard Drive. Please feel free to come back here with further questions. And - by the way - welcome to the forum.