This article was previously published under Q315311
When you try to start Microsoft Windows XP or Microsoft Windows 2000 , you may receive one of the following error messages, depending on your operating system.
Windows could not start because the following file is missing or corrupt: \windows\System32\Drivers\Isapnp.sys
Windows could not start because the following file is missing or corrupt: \Winnt\System32\Drivers\Isapnp.sys
This issue may occur if the Isapnp.sys file is damaged or is not present in the path that the error message specifies.
To resolve this issue, use Recovery Console to replace the Isapnp.sys file.
To replace the Isapnp.sys file in Windows XP, follow these steps:
Start the computer from the Windows XP CD-ROM.
At the Welcome to Setup screen, press R to start Recovery Console.
If you have a dual-boot or a multiple-boot computer, type the number that corresponds to your Windows XP installation when you are prompted to select the Windows installation to log on to, and then press ENTER.
When you are prompted for the Administrator password, type the password, and then press ENTER.
Note If the administrator password is blank, just press ENTER.
At the C:\Windows prompt, type the following command, and then press ENTER: