Boot loader ditched me!

i just installed openSuSe 11.1 on my lab pc. after the installation i went to the boot loader configuration to change the time grub takes to select the OS while booting.
i restarted the thing and now it shows “error no OS”
i tried repairing. it didnt work either.
i’ve got windows installed too.
Can reinstalling openSuSe fix the problem?
i mean, will reinstalling the OS detect windows too?

Repair again.
This time make sure grub goes to MBR

Check this help page too
GRUB Boot Multiboot openSUSE Windows (2000, XP, Vista) using the Grub bootloader.