|Take your computer to someone who knows what they're doing. Your motherboard is NOT made by Phoenix, it's made by Foxconn for Dell. However, any BIOS updates must come from Dell, not from Foxconn, not from Phoenix.|
As OtheHill stated, all you need to do is correct the boot order setting. You do NOT need a BIOS update. If you insist on having it done, here's the BIOS you're going to need:
Dell Vostro Desktop 400 BIOS version 1.0.15
Here's some BIOS info for you:
What is a BIOS ?