|"I want to change the system board language to English"|
What do you mean when you say that ?
You CANNOT change the language displayed in the mboard's bios Setup (unless you flash the bios with an English version, which is NOT recommended that you do for only that reason).
You CAN change the Language that is displayed in Windows XP.
Regional and Language Options
Start - Run - type: intl.cpl , click on OK