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After the error message, users will subsequently get an error code to describe the problem that the Vista activation process faced. The error codes and their descriptions are listed in table below: Error code Description

0xC004C003 The activation server determined that the specific product key is in use.
0xC004C001 The activation server determined that the specific product key is invalid.
0xC004C008 The activation server determined that the specific product key could not be used.
0xC004C812 SL_E_CHREF_BINDING_0UT_0F_T0LERANCE: The activation server determined that the specific product key has exceeded its activation count.
0xCD004F050 The Software Licensing Service reported that the specific product key is invalid.
0xC004C4CE Unable to find a detailed error description.
0×80072328 DNS name does not exist.
0xC004F027 The Software Licensing Service reported that the license is tampered.
0xC003E004 The Software Licensing Service reported that the license has not been evaluated.
0xC004E003 The Software Licensing Service reported that the license evaluation failed.
0xC004F033 The Software Licensing Service reported that the product key is not allowed to be installed. Please see the event log for details.
0XC004D401 The security processor reported a system file mismatch error.
0×80080250 Unrecognized error.
0×8004FC03 unrecognized error.
0X8004FE2D HTTP_STATUS_DENIED.
0×8004FE33 HTTP_STATUS_PROXY_AUTH_REQ.
0×8004FE91 HTTP_STATUS_NOT_SUPPORTED.
0×80072EE7 The server name or address could not be resolved.
0×80072EFD A connection with the server could not be established.
0×80072F78 The server returned an invalid or unrecognized response.
0×80072F8F A security error occurred.

Microsoft has provided suggestion resolutions, solutions or workarounds to the activation problems and erros.

Error codes 0xC004C003, 0xC004C001, 0xC004C008, 0xC004C812, 0xCD004F050, 0xC004C4CE, and 0×80072328

If you receive one of these error codes, change the product key to activate Windows Vista. To do this, follow these steps:

1. Open the System item in Control Panel. To do this, click Start button, type System in the Start Search box, and then click System in the Programs list.

2. In the Windows activation section, click the Change product key link. If you are prompted for an administrator password or for confirmation by User Account Control, type the password.

3. In the Product key field, type the product key, and then click Next.

4. Follow the steps in the Windows Activation Wizard to complete the activation process.

These errors may occur for KMS activation too. For more information, visit Windows Vista Volume Activation 2.0 Step-by-Step Guide, FAQ and Technical Attributes.

Error codes 0xC004F027, 0xC003E004, and 0xC004E003

If you receive one of these error codes, reactivate Windows Vista. To do this, follow these steps:

1. Open the System item in Control Panel. To do this, click Start button, type System in the Start Search box, and then click System in the Programs list.

2. In the Windows activation section, click the Change product key link. If you are prompted for an administrator password or for confirmation by User Account Control, type the password.

3. In the Product key field, type the product key, and then click Next.

4. Follow the steps in the Windows Activation Wizard to complete the activation process.

Error code 0xC004F033

If you receive this error code, verify that the product key can be used to upgrade Windows Vista from the current edition to the edition for which the key is intended.

Error codes 0XC004D401 and 0×80080250

You receive one of these error codes because your antivirus software or Digital Rights Management (DRM) software is incompatible with Windows Vista. Contact the software manufacturer of the antivirus software or of the DRM software to obtain a version that is compatible with Window Vista, and then reactivate Windows Vista.

Error codes 0×8004FC03, 0X8004FE2D, 0×8004FE33, 0×8004FE91, 0×80072EE7, 0×80072EFD, 0×80072F78, and 0×80072F8F

If you receive one of these error codes, verify that your Internet connection is working, and then try to reactivate Windows Vista.

Other than common error codes above, another problem may occur during Windows Vista activation with the symptoms below:

* Activation fails with error code 0×8004FE33.
* The following Error events may be recorded in the Application log:

Log Name: Application
Source: Software Licensing Service
Event ID: 8198
Level: Error Description: License Activation (SLUI.exe) failed with the following error code: 0×80004005

Log Name: Application
Source: Software Licensing Service
Event ID: 1008

Level: Error Description: Acquisition of Secure Processor Certificate failed. Status Code=hr=0×8004FE33
* Activation is not successful, and you are not prompted for credentials.

This issue may occur when you connect to the Internet through a proxy server that is configured with Basic authentication is enabled. In this case, the server requires that you type a username and a password. However, the activation user interface does not let you enter these credentials. Therefore, the Basic authentication fails, and activation is not successful.

To work around this issue, use one of the following methods.

Method 1: Do not use Basic authentication

Do not use Basic authentication on the proxy server.

Method 2: Exclude CRLs URLs from Basic Authentication

If you must use Basic authentication, exclude the URLs for the certificate revocation lists (CRLs) from the requirement for Basic authentication. To do this, configure the following list of CRLs to be unauthenticated on the proxy server:

MicrosoftRootAuthority.crl
MicrosoftProductSecureCommunications.crl'
MicrosoftProductSecureCommunications.crl
MicrosoftProductSecureServer.crl
MicrosoftProductSecureServer.crl

Method 3: Use the telephone to activate Windows

If you cannot use Method 1 and 2, click Use the automated phone system in the Windows Activation Wizard to activate Windows over the telephone.