I'm Spanish, I'm sorry for my bad english

my pc parts are:
Asus K8N-E Deluxe mobo
Sempron 3100+ processor
Seagate 80gb ata 100 in the first IDE in Master mode
LG DVD +-R/RW GSA 4163 16x in the second IDE in master mode
512mb DDR 400mhz
Ati 9250 128mb
A 350w power supply

My problem: When I boot the PC everithing it's OK. The mobo detect all my drives. I reboot my pc and I put the Windows XP Professional (whith the SP1 integrated) CD in the DVD.

A blue screen apears and 2 minutes later, apears a new blue Screen with the 3 options. I click RETURN (to install the OS) and the PC have blocked. Down in the left apears the "Wait..."

I can't install my OS and I need the Pc as soon as possible!!!

Please HELP!!!