You have a Windows Server 2003 or a Windows XP-based computer that has Windows Internet Explorer 8 installed. On this computer, you enable the "Site to Zone Assignment List" Group Policy setting and add a non-US domain to the list, such as "contoso.de." In this scenario, the user profiles of the users who receive this policy cannot be deleted.
Note This issue does not occur if the domain ends with one of the following strings:
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
To resolve this issue, add the following registry subkey: