"Easy." Or so it would seem. Install Problems, AsteriskNOW

Alright, not quite sure which version, because the fantastic website didn’t tell me which ISO I downloaded.
Hardware config:
IBM Thinkpad T23
1133 MHz proc, 512MB Ram
Windows XP Pro, Ubuntu 9.04 (Jaunty)
Netgear MA521 802.11b card
when I try to boot from the CD of the burned ISO in SBM, the error codes are 0x0C or 0xAA. I’ve heard people have solved this by turning their computers upside down and smacking them, which I tried to no avail, knowing this thing was a brick. I know it’s not the CDs, of which I have tried more than a few. I don’t know what to say, except HELP! I’ve been working on this for two days!
Error code PXE-E61 when booting in diagnostic mode, says to check cable, but the drive is OK.