freebsd bootmanager reboots immidiatly

[mikael backman]

Hello.
I am a newbie
I installed FreeBSD 4.9 release to dualboot with
winXP. All went well untill it was time to finish the installation and reboot. I got the options
F1 ??
F2 winxp
F3 Freebsd
on the screen.

When I press F2 winxp is booted fine. But when I press F3
the computer just reboots again and again :-(
No message from the kernel or anything,it just reboots.
How can I fix this?

TIA 
Mikael Backman