This article was previously published under Q326687
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When you upgrade your computer to Windows XP, you may receive an error message that is similar to one of the following:
C0000221 (Bad Image Checksum)
STOP: C0000221 - Bad Image Checksum in ModuleName
STOP: C0000221 - Bad Image Checksum. User32.dll is possibly corrupt. The header check sum does not match the computed check sum.
This issue may occur if any of the following conditions exist:
A damaged file exists in the folder in which Windows is installed, and this file is not overwritten during Setup. For example, if you receive the error message that references the User32.dll file, the User32.dll file may be damaged.
One or more of the random access memory (RAM) modules that are installed in your computer is faulty, or the RAM configuration is incompatible.
To resolve this behavior, use one of the following methods.
Method 1: Extract a New Copy of the User32.dll File from the Windows XP CD
Extract a new copy of the User32.dll file from the Windows XP CD to the drive:\Windows\System32 folder on your hard disk, where drive is the drive on which Windows is installed:
Insert a Microsoft Windows Millennium Edition (Me) or Microsoft Windows 98 Startup disk into your computer, and then restart the computer.
NOTE: For additional information about what to do if you do not have a Windows Millennium Edition or Windows 98 Startup disk, click the following article numbers to view the articles in the Microsoft Knowledge Base:
186300 How to Create a Windows 98 Startup Disk from MS-DOS
When the Windows Startup menu appears, use the ARROW keys to select Start Computer with CD-ROM Support, and then press ENTER.
Make a note of the drive letter of your CD-ROM drive.
Rename the User32.dll file to User32.old. To do so, type the following lines at the command prompt, pressing ENTER after each line, where Drive is the drive on which Windows is installed:
Drive: cd windows\system32 ren user32.dll user32.old
Insert the Windows XP CD into your CD-ROM or DVD-ROM drive.
Extract a new copy of the User32.dll file from the Windows XP CD to the Windows\System32 folder on your hard disk. To do so, type the following lines at a command prompt, pressing ENTER after each line, where CDROMDrive is the drive letter of the CD-ROM or DVD-ROM drive that contains the Windows XP CD-ROM, and Drive is the drive on which Windows is installed:
For example, if your CD-ROM is drive E and Windows is installed on drive C, type extract e:\i386\user32.dl_ c:\windows\system32\user32.dll, and then press ENTER.
Remove the Windows 98 or Windows Millennium Edition startup disk from your computer, and then restart the computer.
Method 2: Remove or Replace the Faulty RAM
Remove the memory modules that are installed in your computer, leaving enough RAM for the computer to start and run Windows. Restart the computer, and then run Setup again.
For additional information about Windows XP RAM requirements, click the following article number to view the article in the Microsoft Knowledge Base:
314865 System Requirements for Windows XP Operating Systems
If the issue is not resolved, remove a different memory module. To identify the specific memory module that is not working correctly, you may have to restart your computer more than one time.
For information about how to add and remove RAM to the computer, contact the manufacturer of the computer, or view the documentation that is included with your computer.
Method 3: Install Windows to a Different Folder
NOTE: Before you install Windows to a different folder, first try the troubleshooting procedures in the following article in the Microsoft Knowledge Base:
310064 HOW TO: Troubleshoot Windows XP Setup Problems During Installation When You Upgrade from Windows 98 or Windows Me
If the issue is not resolved by using the troubleshooting procedures in 310064, install Windows to a different folder. For more information about how to do this, see the "Installing to a New Folder" section of the following article in the Microsoft Knowledge Base:
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