Bios Update Help!

[elantratuner]

Hi, I'm having trouble flashing my Bios. I have never done this before but my computer is not recognizing my 250 Gig Hd's full capacity. It reads as only 136 GB. Well on that not I ran BiosAgentPlus and this is what it read:

Bios Type: Phoenix-Award
Bios Date: September 2nd 2002
Bios ID: 09/02/2002-P4M266-8235-6A6LWV5BC-00-None
Bios OEM: Model: P4MA Pro Bios revision: 1.22-6.00 PG
Chipset: VIA 82C3148 rev 0
SuperIO: Unknown
Manufacturer: Via Technologies, Inc.
Motherboard: P4M266-8235

So does anyone know where to find the Bios update for this? preferably a free one! Any help would be greatly appreciated, Thanks!

[caperjack]

from the motherboard board manufacture,i think this is yours but you should double check to make sure .If you do this wrong your motherboard will become useless!
http://www.biostar-usa.com/mbdetails.asp?model=u8668+d

[elantratuner]

No, thats not the correct one, I know my computer takes PC3200 Ram and I beleive the manufacturer was VIA.

[caperjack]

No, thats not the correct one, I know my computer takes PC3200 Ram and I beleive the manufacturer was VIA.

yeah ok, what ever you say !via makes the chipsets,for these boards
I have same or similar board, mine is P4M266A-Vt8751 and its made by Biostar,it the

download this program and run it ,check the notherboard section and see what it says
http://www.cpuid.com/cpuz.php