Windows Boot Errors: Unable to Load Device Driver

When you start Windows XP, you may receive one of the following error messages:

STOP: 0xc000026C [Unable to load device driver] DriverName

-or-

STOP: 0xc0000221 [Unable to load device driver] DriverName

-or-

STOP: 0xc0000221. Bad image check sum, the image user32.dll is possibly corrupt. The header check sum does not match the computed check sum.

DriverName is the name of the device driver file.

This is usually caused by a corrupt or missing device driver (the software that runs the hardware).

So how do you fix it?

Use Recovery Console to replace the missing or damaged driver file. To do so, follow these steps:

1.	Insert the Windows XP CD-ROM into the CD-ROM or DVD-ROM drive, and then restart the computer. Select any options that are required to start the computer from the CD-ROM or DVD-ROM drive if you are prompted to do so.
2.	When the "Welcome to Setup" screen appears, press R to start Recovery Console.
3.	If your computer is configured for dual booting or multiple booting, select the relevant Windows XP installation.
4.	When you are prompted to do so, type the administrator password, and then press ENTER. Note In Windows XP Home Edition, the administrator password is\ blank by default.
5.	At the command prompt, type the following command, and then press ENTER: cd windows\system32\drivers
6.	To rename the damaged driver file, type the following command, and then press ENTER ren `drivername`.sys `drivername`.bak where `drivername` is the name of the damaged driver file.
7.	To copy the driver from the Windows XP CD-ROM to the Drivers folder, type the following command, and then press ENTER copy `cd-rom`:\i386 `drivername` where `cd-rom` is the drive letter for the drive that contains the Windows XP CD-ROM.
8.	Type exit, press ENTER, and then restart the computer.