Freebsd firewall

[Aperez]

Hello:

I am trying to set up a FreeBSD 5.3 firewall. I have an old P I with 64 
KB of memory. When I try to install FreeBSD, the PC hangs just after 
showing the deamon screen and showes the following message:

"stack overflow"

I am thinking maybe the PC is too old for FreeBSD because I managed to 
install Debian in it.

Does anybody know what does "stack overflow" mean? and is there anything 
I can do in order to install Freebsd in this old PC?

Thanks in advance