When you try to validate a copy of Windows Vista, you may receive an error message that resembles the following:
The Validation service is unable to determine whether this copy of Windows Vista is genuine.
You may receive this error message even though you were able to activate Windows Vista as expected.Note
Typically, this issue occurs when Windows Vista was preinstalled on a computer by an OEM.
This issue may occur if the licensing data in the BIOS is incorrect.
To resolve this issue, visit the following Microsoft Web site, and then click Validate Windows