How can i reset the BIOS to default?

GradeAbra said:

Topic.

depends on the manufacturer of your board , some have a jumper on the motherboard that you change , some have a clear cmos button on the back of the case ..

Most clear cmos settings are on the motherboard, which does involve opening the case.

GradeAbra said:

Where is the clear cmos button on the back of the case? So in another words i don't need to open up the computer?

   Note

This wil reset ALL Bios settings including the date and time

Here's what I want you to do. Unplug your computer. Then, hold down the power button that is on your computer for 10 seconds (while it is unplugged) This will drain all of the power out of your pc (except the CMOS) Then, open up your pc. Locate the silver, round battery on the motherboard. Then, remove the battery (you may need a pocket knife for this. Be very careful with the knife, so you don't damage anything) Now, while leaving your pc unplugged with the battery out, hold down the power button again for 10 seconds. Then, insert the battery where it was before (and be sure not to put the battery in upside down) and close up your pc. Then, plug in the power cord and wait 3-5 seconds. If your pc doesn't automatically power on, press the power button. Your pc will POST and then it will display a message on the screen, indicating that the CMOS has been reset.

After i reset the BIOS, i can no longer update window. What should i do?

If i format my hard disk will that return everything to factory default setting?

Have you replaced the battery? Is the date/time correct in the BIOS? You will need to reset these settings as a minimum.