ok you say that you are using redhat 7.3 k then.when you boot up linux there is a directy called
/boot/grub
thyp in
cd /boot/grub
then open the grub.conf with your favirite text edidtor, notice you have to be root
there should be a line called default
default= somthing
now the numbering for the boot options goes
0
1
2
3
etc
etc
so it is probably set to boot 1
just change it to whatever the number of the windows boot is.
i hoped this helped