intel UNHL, PXE-2.1(BUILD 082)COPYRIGHT (C)1997-2000 INTEL CORPORATION tHIS PRODUCT IS COVER BY ONE OR MORE OF THE FOLLOWING PATTENTS
US5,307,459, US5,434,874,US5,732, 094, US6,570,884,US6,115,76, AND US6,327,625
FOR REALTEK RTL8111B/8111C GIGABIT ETHERNET CONTROLLER V2.18 (080722)
PXE-E61:MEDIA TEST FAILURE, CHECK CABLE
PEX-MOF: EXITING PXE ROM.
That message is telling you the system is trying to boot from a network source, having tried all other methods and failed to get in.
You could tap whatever key tells you to if you want to go into BIOS or Setup and disable that boot option but it might be an indication that your hard disk isn't booting properly. If it is top of the list in the Boot Options or Boot Sequence settings, disable it or move it downhill.
If it's already below the hard disk you have a disk error. Use you Windows CD/DVD to fix that error if you have one - otherwise, post back.
If it won't boot at all, use the computer you're posting from to download a Linux operating system - try PCLinuxOS from http://www.pclinuxos.com. That's a free on and you need to burn it to a CD and make that disk bootable so it can test the machine's hardware. Use a good quality slow burner like ImgBurn - it makes light work of burning ISOs which is what makes the disk able to boot a system.
If your machine is a 64 bit setup, you'll need to use another OS - Ubuntu does a 64 bit version and you can find that free of charge at http://www.ubuntu.com/download