To reinstall, you need to change the boot order in the BIOS that places the CD ROM device at the top and put in a bootable disk with your OS (in this case, XP). If you have done this properly and still no luck, you could have a bad disk or CD ROM device. Is your XP disk an original retail or OEM version or a recovery disk of some sort?
From the file of "Messing Around Where I Shouldn't Be", I was attempting to clean-up my hard drive on my pc laptop and instead clearly deleted things I shouldn't have. Now I can't boot the computer past this message,
"Invalid System Disk. Replace the disk, then press any key."
I have tried to reinstall XP and it wouldn't take the disk. I have tried to figure out if there is anything I could do in the BIOS - no dice. I am not very good at this. There is nothing I really need on the hard drive, so if anyone out there could help me figure out how I could get my laptop up and running again, I would greatly appreciate it. I am at your mercy.