- Click Start, right-click My Computer, and then click Properties.
- On the General tab, under Registered to, examine the number that is listed.
If the product ID is listed in the "Cause" sectionIf the product ID is listed in the "Cause" section, you may be a victim of software piracy. To report software piracy, visit the following Microsoft Web site:
If the product ID is not listed in the "Cause" sectionIf the product ID is not listed in the "Cause" section, there are other steps that you can take to resolve this error message. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
If you are a Microsoft volume license customer and you have licenses for Windows XP ProfessionalIf you are a Microsoft volume license customer and you have licenses for Windows XP Professional, perform a clean install of Windows XP on the computer that received the error message. Use the Windows XP Professional media and the Volume License product key that is provided with your agreement. If you cannot perform a clean install, you must change the product ID.
If you have a valid volume license key but you set up the computer by using an invalid key, click the following article numbers to view the articles in the Microsoft Knowledge Base:
If you are outside the United States, contact the Microsoft subsidiary for your area. To locate your subsidiary, visit the following Microsoft Web site: