PANIC: PAGE FAULT

Hi all,

I'm trying to install FreeBSD-5.1 on the PC with PIII,512MB SDRAM, 30GB 
Barracuda II Model ST330630A. But following error has occured.

Fatal trap 12: page fault while in kernel mode
fault virtual address	= 0x0
fault code		= supervisor read, page not present
instruction pointer	= 0x8:0xc035eb26
stack pointer		= 0x10:0xdba72bb8
frame pointer		= 0x10:0xdba72c2c
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, def32 1, gran1
processor eflags	= interrupt enabled, resume, IOPL = 0
current process	= 80 (sh)
trap number		= 12
panic: page fault

syncing disks, buffers remaining... 184 184 184 184 184 184 184 184 184 184 
184 184 184 184
giving up on 148 buffers
Uptime: 16s
Terminate ACPI

PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!