I fear a have a problem..

I set up windows, and then started the system from the suse dvd. First, I went to advanced options and wantet to setup grub manually, i chose the MBR as installation location. I clicked ok and after it was finished, rebooted. Still only windows. Then i tried the (user defined, package checking excluded) automatic repair, which also checked the file systems and fstab, but when it comes to the bootloader, setup alway says: "Looking for Bootloader: GRUB found ---- OK" and does nothing about grub... but still i can only boot windows.

any ideas?