Computer won't boot automatically

Hey, this is my first time on this forum,
and I have a slightly irritating problem that I would like some help clearing up if possible.
The whole shebang is this; I recently installed Vista and am now running a dual o/s system. Both O/S's work fine, but for some reason, the motherboard startup screen stays up indefinitely until I go to POST. Which, takes a while to come up. Not a big deal, but if anyone knows how to fix this, it would be appreciated.

-Gabe