Trying to reboot from the hard drive onan Acer One netbook -- says a driver is missing or corrupt -- system32DRIVERS/pci.sys

You need to re-install windows as your windows is corrupted.

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

the file is corrupted. find a replacement

Restart the computer and press the necessary key to enter BIOS setup and see if the hard drive is listed in the BIOS

If it is not listed in the BIOS you need to replace the hard drive

To resolve this problem, replace the missing or corrupted Ntfs.sys file:

1. Use the Windows XP startup disks or the Windows XP CD to restart your computer.
2. When the "Welcome to Setup" screen appears, press R to select the To repair a Windows XP installation using Recovery Console, press R option.
3. Type the number of the Windows installation that you want to access from the Recovery Console, and then press ENTER.
4. Type the administrator password when you are prompted, and then press ENTER. If no administrator password exists, just press ENTER.
5. At the command prompt, type the following commands (press ENTER after each command): cd \windows\system32\drivers
   
   ren ntfs.sys ntfs.oldNote This step renames the corrupted Ntfs.sys file to Ntfs.old. If the Ntfs.sys file is not found, the file is missing.
6. At the command prompt, type the following command, and then press ENTER: copy cd:\i386\ntfs.sys drive:\windows\system32\driversWhere cd is the drive letter for the CD-ROM drive that contains the Windows XP CD, and drive is the drive where you installed Windows XP.
7. Remove the Windows XP CD from your CD-ROM drive, type quit at a command prompt, and then press ENTER to quit the Recovery Console.
8. Restart the computer.

ya you can transfer that file but it is difficult as usual... you need to some dos and using this dos windows you can copied that file into your c: drive...

but i suggest try to repair with any xp cd

ITS EASY JUST COPY THE FILE pci.sys from any other computer from System32/DRIVERS/pci.sys .SOUNDS FUN?BUT I KNOW IT WORKS

The file “Windows/System/Drivers/mup.sys” is not actually causing the problem. It’s the next step after mup.sys that’s causing the computer to hang. That next step consists of the OS checking the registry files for plug and play devices.
Some causes are: new or defective hardware installed, corrupted registry, (caused by virus), defective or corrupted hard drive, just to name a few.
Try removing all devices attached to the computer like printer, web cam, flash drives, etc.
If your computer has a PCI or AGP graphics card AND your motherbrd has a VGA connector, remove the video card and use the one on the motherbrd.
If the above doesn’t work, try running “CHKDSK /P” from the Windows recovery console.



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Thank You.

you may want to try booting up from xp or recovery disk and select "R" to repair.

You sould be able to obtain this from your i386 folder, follow these instructions. http://windows.ittoolbox.com/groups/technical-functional/windows-xp-home-l/xp-wont-boot-up-system32driverspcisys-406490