looks like that board came out in 2002? And Soltek is out of business?! Finding new drivers may be an impossible task
I found your Bios here: http://www.updrivers.com/search/SL-75FRV
Here is the direct download I got: http://88.198.57.98/updrivers/pcpro/treiber/mboard/soltek/75frv13.zip