Well, you have been warned.
You can do this on a WinXP machine that has a floppy disk drive and a CD burner:
Download a boot disk from http://www.bootdisk.com./
Create a boot diskette from the downloaded file.
Add your BIOS flash program to this diskette.
Boot the machine from the diskette (for testing purposes)
Use the CD burner to burn a bootable CD.
Boot the Windows 7 PC with this CD.
Flash the BIOS.
This process is not trivial.
Inexperienced users are unlikely to succeed with it.
Note also that flashing a BIOS is rarely required.
If your BIOS does not see the disk then there is probably a much simpler reason, e.g. a bad cable or an incorrect jumper setting.
Note also that your question has nothing whatsoever to do with Windows.
A hardware forum would be a much better place to discuss this topic.
It is where you would get a proper peer review of the issue.
hope this helps
if your computer came with a motherboard disc the sound drivers could be on it
click start control panel administrative tools computer management device manager scroll to sound video and game controllers you might see a yellow question exclamation mark? ! or a red X Right click to reinstall drivers
click start control panel sounds and audio volume advanced speakers make sure you have selected the
(appropriate speakers) also audio you will find 3 drop down lists make sure you have selected the correct speaker settings there
click start control panel sounds and audio devices select advanced there might be a tick in the mute box untick it
hope this helps if you dont have a motherboard disk you will have to download the drivershttp://download.cnet.com/2000-20_4.html
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