When you boot from the XP install disc, what error message are you getting? How far into the setup are you getting? Do you get to the point where it asks you if you if you want to create a partition? Does your laptop have a SATA hard drive? If so, did you disable AHCI in the BIOS? To install XP on a PC with a SATA hard drive, you need to disable AHCI because the XP install software doesn't support SATA.
Had a Acer Aspire laptop with old version of Ubuntu on it. Used a free Killdisk cd on it and tried to reinstall Windows XP from a cd. Cannot get it to reinstall. Also, have some "non authentic " cds with windows on them that have worked in past and now they wont reinstall either. Have win 32 bit and win 64 bit.