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One of my friend call me and ask me help him to resolve his pc problem. So I ask him what wrong ? He tell me when start the computer the Autocheck program not found error
message appears. After search on google I found the solution for this error.

To resolve this problem, follow these steps:
1. Insert the Windows XP startup disk, and then close the Welcome to Microsoft Windows XP window if it appears.
2. Click Start, click Run, type cmd, and then click OK.
3. At the command prompt, type the following command, and then press ENTER.
copy drive letter:\i386\autochk.exe %WINDIR%\system32

Note: The drive letter placeholder represents the drive, such as “D:”, that is running the Windows XP startup disk.

4. Type Y when you receive the following message:
Overwrite C:\WINDOWS\system32\autochk.exe? (Yes/No/All):
5. Remove the Windows XP startup disk, and then restart the computer.

For more information read Microsoft Support