This article was previously published under Q322963
When you try to install Symantec's Norton AntiVirus 2001 on a Windows XP-based computer, you may receive the following error message:
The System Administrator has set policies to prevent this installation.
This behavior may occur if, in the past, you tried to install Norton AntiVirus version 2000 or Norton AntiVirus version 2001 on this computer. Under this scenario, the installation of Norton AntiVirus 2001 and later versions may be unsuccessful. This is because versions of Norton AntiVirus earlier than version 2001 are not compatible with Windows XP.
Warning This workaround may make your computer or your network more vulnerable to attack by malicious users or by malicious software such as viruses. We do not recommend this workaround but are providing this information so that you can implement this workaround at your own discretion. Use this workaround at your own risk.
Note An antivirus program is designed to help protect your computer from viruses. You must not download or open files from sources that you do not trust, visit Web sites that you do not trust, or open e-mail attachments when your antivirus program is disabled.
For additional information about computer viruses, click the following article number to view the article in the Microsoft Knowledge Base:
129972Computer viruses: description, prevention, and recovery
To resolve this issue, completely remove all Norton AntiVirus files and registry settings that were modified by previous installations of NortonAntiVirus. To do so, follow these steps.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
Download the Norton AntiVirus Rnav.exe removal utility. To do this, visit the following Symantec download site:
For additional information about incompatibility between Norton AntiVirus 2001 and Windows XP, click the article number below to view the article in the Microsoft Knowledge Base:
286601 Symantec Norton Anti-Virus 2001 Is Not Compatible with Windows XP
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