I have a computer that it is installed Windows XP, The problem is that when i switch it on it says Boot failure, Insert a diskett in A and press any kes when ready. I tried to install Windows XP for serverall times but it keeps on displaying that massage.Please help.I dont know much about computers.

Your harddrive may have died...
The computer stars up and auto matically looks for the first bootable device as programed in order...if nothing is found then you recieve that message'

to boot xp there are three major files in your system
you must had a boot disket, (not sure what you do if you do not have A Drive)
the files are NTDECT.com, boot.ini and NTLDR you have to put them on a bootable Disk in bios change to boot from A and after you have the computer running copy those three files to your root directory'
you can get these files of internet I think
SkipD
ps works sometimes not all
SkipD