doesn't look good. You should be able to enter the setup/bios.
Press F1 to enter the setup and look if your Bios shows your hard disk. Checks your boot priority and move your hard disk on top.
You could also download knoppix a free linux live boot cd. You can boot out of your disk (no installation required) and after booting up, see if you can access your hard disk.
These are just ideas, but iam afraid a Windows reinstallation might be necessary or at least an Repair installaton, both requires the Windows Xp CD