Help Please!

So long story short, I created a partition with Boot Camp then installed Windows XP, a long 1 1/2 grueling hours later and a lot of gray hairs later, Windows took over my Mac. Thanks to a wonderful suggestion on a different thread, I held OPTION when starting it (had to use a different computer to research) and it gave me the option of Mac or Windows. PHEW.

Anyways, I deleted the Windows Partition and am not looking back. I will just go get a dang cheap computer for the one software item I need to use that doesn't convert.

However, when I re-boot my computer, I still have to use the Option key, even though the only option is Mac HD. How do I get it to just automatically start up on my regular OS?

Thanks!

 

I'm aware, just didn't know a creative title that would fit my problem.