the reason you are having trouble is probably because this is not actually an error message. this statement appears on screen as the motherboard's BIOS finishes it's POST (Power On Self Test). generally if it stalls at this screen it means your pc has not detected any bootable drives. being that you are new to building computers i am going to guess that that is indeed the case. have you actually installed an operating system like windows? if no then you will need a windows disc (a legitimate one as we do not condone piracy) and you will need to set your pc to boot from cd (probably not necessary). turn the pc on and put the windows disc in before you get the "DMI Pool" message and at some point the message "Press any key to boot from cd" should appear. at that point.....well hit any key
. that should bring up the windows installer and it is pretty straight forward from there on, unless you have a SATA hdd then it may be little trickier.