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The only real way (using WinXP) is to use recovery discs and reinstall from scratch. You can also just uninstall all the additional programs you've installed as well as your user files. that may take a bit longer than using the recovery CD's. if you're trying to boot from the recovery CD press F2 at boot (or whatever key to enter bios) and change your boot order to start with the CD/DVD drive.

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it wont work...(recovery CDs mostly dont work)
you need to have a WinXP boot and install CD...as many system files of windows are not re-installed by the recovery cD

get a Win XP CD(a bootable one)...i.e. original WindowsCD(even a pirated CD may work)
insert the CD in the CD drive and re-start the PC....(BIOS) must have boot seq set to CD ROM as the 1st boot drive...(if not then do it)...press F2, Del, or F10 key when PC starts...go to the boot menu and chose the boot seq and select CD ROM as the 1st boot drive...then save and restart....
let it boot from CD...
now you can repair the OS
Reg

You don't need a copy to install winxp in your laptop. You need the key of your genuin winxp. If you had a genuin MS winxp OS earlier, find the key. Write it down in a paper. Now use any winxp cd to install and type your key (genuin winxp). You are just fine. This is as good as your previous genuin winxp.
If you need it only to boot then create a recovery disk from from your friend's winxp machine. Use it for booting.

You will need a FULL WinXP system disk (asume your system is Win) either buy a new XP CD (i doubt you will get it)
but.....
to get a pirated WinXP system disk click the foll link....before that downlaod a software called UTorrent or BitTottent....google it
the foll link will downlaod the link file of Torrent and that will help you download the full version.....believe me this works....700MB ISO file...burn on CD/DVd using any CD burner software like Nero....

http://thepiratebay.org/details.php?id=3493182
once you download the full OS from piratebay...make a CD/DVD from the ISO image file that is obtained from piratebay....boot you system using that CD....BIOS in your system must be reset to boot from CD as the 1st boot seq in BIOS....

recovery disk will not work....

from my exp recovery CD is of no use at all....if ur OS is corrupted.....use a WinXP install CD and boot from that. to do that...insert the CD in the CD/dvd drive and switch on...if the boot seq in BIOS is set to CD drive then it will boot first from that else it will boot from HD...so if u can get into BIOS by pressing the F1/F2/Del key etc and change the boot seq to the foll:
1st boot CD rom
2nd boot Floppy
3rd boot HDD0

u can even just disable 2nd and 3rd apart from keeping 1st boot to CD rom
if u have more than one HD or more than one partition in ur HD then u can install a new fresh Win XP in that and once that's done then change the boot seq back to HDD0 from CDROM drive in the 1st boot order
it will get back ur machine live then u can copy all ur imp files to a pen drive or CD then once u r safe of ur data u can do a low level format of the full HD and then aprtition that as per ur requirment

You have two ways to solve the problem of "Pci.sys Is Missing or Corrupt"
Error Message When You Start Windows.

1.Booting with WinXP CD to access the Recovery Console’s Repair option,
and then copy from WinXP CD the missing or damaged Pci.sys file to
Systemdrive:\Windows\System32\drivers folder , Exit and Reboot.

start the recovery console and type:
set AllowAllPaths = true
expand d:\i386\pci.sy_ c:\windows\system\drivers32 /y
If you don't type
set AllowAllPaths = true you can't access the windows folder.

2. Booting with WinXP CD and then perform a Windows XP Repair Reinstall
of the currently installed system.

If you need detailed assistance post with details of your Operating system
[WinXP Home vs WinXP Pro and the SP status i.e SP1 or SP2 ]

See
http://support.microsoft.com/default.aspx?scid=319136

NTLDR is short for NT loader – a program loaded from the hard drive boot sector that displays the Microsoft Windows NT startup menu and helps Microsoft Windows NT load. So when it goes missing for some reason, your windows cannot load.
Cause:
1. Computer is booting from a non-bootable source.
2. Computer hard disk drive is not properly setup in BIOS.
3. Corrupt NTLDR and/or NTDETECT.COM file.
4. Misconfiguration with the boot.ini file.
5. Attempting to upgrade from a Windows 95, 98, or ME computer that is using FAT32.
6. New hard disk drive being added.
7. Corrupt boot sector / master boot record.
8. Seriously corrupted version of Windows 2000 or Windows XP.
9. Loose or Faulty IDE/EIDE hard disk drive cable.
if there is attached drive ,remove the drive first before restarting the system if not then if you had access to another computer, copy the NTLDR and NTDETECT.COM which is available from the recovery CD which comes with computer. If you do not have the recovery CD, its available on microsoft site or is available from another computer using the same Operating System (Windows XP ). The location may be C:\i386\ntldr C:\i386\ntdetect.com use a bootable disc to restart the computer (the Win XP bootable CD or Win 98 bootable CD worked). After entering MS DOS mode, copy these 2 files to the C drive in the proper location. After restart, then pressing F10 on start up (used for system recovery ), then start the repair of Windows via system recovery This will reinstalled all Windows drivers and system files, while preserving all data on your computer.

you have to fix error on harddisk.
If you have winrecovery disk you can boot your computer with winxp recovery disk then boot computer with recovery disk then type in recovery console prompt "chkdsk /r" then pres "y"
then it fix error on harddisk.

You will need to re-install windows, or use the windows recovery solution..

To use the recovery solution:

Insert your windows installation CD

reboot the computer

when prompted, push any button to boot from the CD

When asked if you want to install, or use the recovery console, select " install "

You will be promted again to install or use recovery, use " recovery "

Windows will delete hardware profile information, then continue to install as normal. Once completed, you should be able to use windows normally again, and you should not lose any data on the drive, nor any software installed or settings.

Boot into the recovery console and run; chkdsk /r Note the space between dsk and /r. If you are unsure of how to get into the recovery console, and have access to a Windows CD; 1. Boot the computer with the Windows CD 2. Select the option to enter the recovery console 3. At the prompt, type CHKDSK /R and press enter (this may take a while). If you do not have access to a Windows CD, but DO have access to a working system with a CD-R or CD/RW, download the XP Recovery Console CD ISO* and burn it to CD using DeepBurner (or whichever application you have that supports such (DeepBurner, Nero, MagicISO etc)). http://archives.mysteryfcm.co.uk/?f=System/Diagnostics/XP_Recovery_Console_CD_ISO * This CD ISO will load pretty much the same as the XP installation program but will NOT provide installation options, ONLY the recovery console. This can be used regardless of whether you are using 2000, XP, 2003 or Vista. Once you have the ISO burnt, boot the computer using the CD and go to the recovery console. Once at the recovery console, type the following and press enter; CHKDSK /R