Describe your Acer Aspire One PC Notebook

First boot your computer with winxp recovery disk.
then ewnter in recovery console then type in command prompt "chkdsk /r"
then press "y" then it fix error on disk.
then check.

OPTION 1: Boot from your Windows CD and follow the directions below to start Recovery Console.
Insert the Setup compact disc (CD) and restart the computer. If prompted, select any options required to boot from the CD.
When the text-based part of Setup begins, follow the prompts; choose the repair or recover option by pressing R.

If you have a dual-boot or multiple-boot system, choose the installation that you need to access from the Recovery Console.
When prompted, type the Administrator password. (if you didn't create one try pressing enter).

At the system prompt, type Recovery Console commands; type help for a list of commands, or help commandname for help on a specific command.

Most likely you will need to expand the file from the CD. The command would be expand d:\i386\hal.dl_ c:\windows\system32\hal.dll. Substitute d: for the drive letter of your CD. Once you have expanded the file type "exit" to exit the Recovery Console and restart the computer.
OPTION 2: Remove hard drive from system.
Add Hard drive to a 2nd WORKING XP System. As Slave on Cable select.

***(all references to “D:\” are the Slave Hard drive damaged windows)***

Boot system and enable - Explorer\tools\folder options

Display contents of system folders.
Show Hidden Files and Folders.
UN-check Hide Protected OS Files.

Go to “D:\” open Boot.ini in NOTEPAD, remove the Extra OS’s added with option 1.
Close and Save changes to Boot.ini

Go to “My Computer” Right click on “D:\” select SEARCH “D:\”

Search “All or Part of the File Name” = “hal”

Hal.dll may or may not be found in “D:\WINDOWS\System32” either way it’s no good.
A working copy of hal.dll WILL be found in “C:\WINDOWS\ServicePackFiles\i386”
COPY THAT FILE “D:\WINDOWS\ServicePackFiles\i386\hal.dll”
And Paste it to “D:\WINDOWS\System32” folder; if it asks to overwrite say YES.

You may now un-do the changes made to Explorer\tools\folder options to RE-Hide files.
Shut Down the computer.

Remove the 2nd Drive and reinstall it to its own tower as Master.

You should Now be able to boot the computer up as if nothing ever happened.

With the exception that it will prompt you to reinstall some drivers, Just say YES and let it auto detect …THEY ARE ALREADY THERE. And will setup fine.