How to Uninstall Windows XP Pro X64 Bites
If you only have the Windows XP Professional 64-bit version installed on your computer, you will have to format the drive in which it is installed to remove it. However, if you have both the 32-bit and the 64-bit versions of Windows XP installed, it is possible to remove Windows XP 64-bit edition and continue to run the 32-bit edition. For this, you will have to remove some entries from the boot.ini file and then delete the Windows folder of the 64-bit edition.
Instructions
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Remove the Entries From the boot.ini file
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Start your computer and log in as administrator to the 32-bit version of Windows XP.
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Go to "Start," and then click on "My Computer."
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In the My Computer window that opens, click on the "Tools" menu and then click on "Folder Options."
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In the Folder Options dialog box that opens, click on the "View" tab.
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Under "Advanced Settings," and then under "Hidden Files and Folders," click on the "Show Hidden Files and Folders" option.
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Uncheck the "Hide Extensions for Known File Types" check box and click "OK."
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Go to "Start," click on "Run," type "C:\boot.ini" in the open box and then click "OK."
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In boot.ini file that opens, delete the following entry : "multi(0)disk(0)rdisk(0)partition(2)\Windows="Microsoft Windows x64 " /fastdetect".
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Replace the entry for "default=" with "default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS".
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In the "File" menu, click "Save."
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In the "File" menu, click "Exit."
Delete the Windows Folder
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Go to "Start," and then click on "My Computer."
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In the My Computer window that opens, double-click on the drive in which Windows XP 64-bit is installed.
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Right-click on the "WINDOWS" folder and then click "Delete."
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Click "Yes," when asked to confirm deletion.
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References
- Microsoft Windows XP Inside Out, Second Edition; Ed Bott, Carl Siechert, and Craig Stinson; 2004