If you had windows in((STALLED)) before that, it should still be in the file, all grub-install does is update the boot sectors. If it wasn't installed, you would add the following to the /etc/grub/grub.conf file:
title Windows
root(hdX,Y)
chainloader +1
Where X is the hard drive, usually hd0 or hd1, and Y is the partition number. Grub works a little weird though, partition 1 would be partition 0 in grub. 2 would be 1... and so forth.