Problem with boot media

I was looking in the forums and i saw this http://forums.majorgeeks.com/showthread.php?t=267403

But my laptop is a MSI U135, Xp version. I was thinking that the problem is the hard disc but say that message:
Realtek PCIe FE Family Controller Series v1.24 (10/07/10)
PXE-E61: Media test failure, check cable

PXE-M0F: Exiting PXE ROM

Reboot and Select proper Boot device
or Insert Boot Media in selected Boot device and press a key

What can i do?

 

Enter the BIOS, and disable the PXE ROM.

The PXE is ordinarily only necessary if you are imaging a hard drive by connecting to a remote server on a network to image a hard drive on a network PC.

After disabling the PXE, you will need to select your hard drive as a boot device and set your boot order with the CD-ROM drive in first position.

However, if your PC does not detect the hard drive, disabling the PXE might not make a difference.