|Don't flash the bios, it's not the problem. The bios is putting out the beep(s) and bios' rarely fail.|
If the beeps are when you try to boot. It's probably a memory or video adapter problem.
If the beeps are when you are using the system, it could be overheating.
For what it's worth to XP users: When you click on the 'Command Prompt' you are just causing the 'Command prompt' to be displayed. This prompt gives you access to the 'NT Virtual DOS Manager'.