I have a MS-6389, but MicroStar does not have the BIOS, and I can't find The BIOS on www.gateway.com.
I have a 200 GB harddrive but without the update I can only see and use 137 GB's.

is that an intel or amd based board

Have you tried MSI's Live Update 3 to detect and install the latest BIOS?

http://www.msi.com.tw/program/products/mai..._liveupdate.php

MSI's Live Update 3 wont find any think for my BIOS.
The board was made by MSI but, Gateway subports it, and we all know gateway would never do something that make the people that buy thear PC's happy, or make it ez to put big harddrives in your PC's without buying a new board.

You have a big problem on ur hands, hmm ur talking about updating ur bios to be able to see the rest of HHD size fair enough. But have u thought of using apps like partition magic 8 to see how much space is unpartitioned and to see if u can resize ur 137Gig back up to near 200Gig? I presume your using a Windows operating system. The file architecture for windows isn't an extact 1000 kbs for every 1mb its 1024kbs, This means for example if u have a 200Gig hard drive u will not come out seeing 200Gig but u might see 190Gig which is really 200Gig using 1024kbs per Mb.

I could be rambling on about nothing here but have u ever thought of the fact it might be a 140Gig hard drive? i have 2x 60 HHD's and i only get to see around 57gig on each drive due to its file architecture.

48bit LBA was added in XP SP1 IIRC, you don't need a newer bios

http://support.microsoft.com/default.aspx?...kb;en-us;303013
it says:
Your computer must meet the following requirements to use 48-bit LBA ATAPI support:
48-bit LBA-compatible BIOS.
137-GB hard disk or larger.
You must have Windows XP SP1 installed.

I have Windows XP SP1, and the Drive, but my BIOS does not have 48-bit LBA (it has LBA, but not 48-bit LBA).