OS Master Boot Record Menu

I installed win XP on my D: drive (Win 98 on C: drive) and had the option to boot to either OS on startup. About 2 weeks later after downloading and trying to scan something from a peer to peer sharing website Norton informed me that my MBR had changed. I told it to restore the old one thinking it found a virus and on reboot found that I had lost the option to boot to XP.

Can anyone tell me how to get this boot menu back.
Thanks in advance to anyone who takes the time to reply to this.