Lost openseuse after win7 installation

After installing Windows 7 my computer doesn’ t ask which OS to start. I starts with win7 automatically. How can I start my computer with OpenSuse?

Hello, I think it is as easy as to use your OpenSuSE CD/DVD (boot from CD/DVD), click on repair system and reinstall grub. This is a common problem as Windows does not ask if it should place any entries for booting into other existing OS’s. Grub is the boot loader and when reinstalling it Grub will give you the option to choose which OS you wish to load, including Windows7.

As mentioned by F_Sauce, this is common grub entry issue. Hope the link below will help.

Programming and Linux: Solution: Grub issues in opensuse with dual boot(XP,Vista)