cannot install freebsd

[alex]

while i am trying to install freebsd 5.2.1 i get and error:

something about video card timing 10.000msec
panic:ohci_add_done: addr 0x00004000 not found
cpuid = 0;

i have searched most of the freebsd handbook, any forum i could find, 
and talking to a firend i can find NOTHING about this.  apparently i'm 
the only newbie to ever have this problem. 

i thought it was my keyboard and mouse being usb, so i tried ps/2 ones.  
the only difference is one it hits that error it actually reboots in 
15sec like it says. 

i believe that the problem is with the default smp kernel, or my 
motherboard. 
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i have a gigabyte 7dpxdw-p motherboard
2 gig of ecc mem
gigabyte nvidia 5700
no modem
no extra nic card
no extra monitor
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coud you plz help????

thanks
draejin