Cofiguration options for updating windows xp professional
Backup your Registry/System State If you performed the above steps incorrectly, or used an invalid key, your system may not be able to boot.
Use the F8 key to boot to the last known good configuration and retry with a valid key.
However, Dell did offer the operating system for a short time.
Because of security concerns about piracy, Microsoft does not provide a tool that allows you to view the Product Activation Key (or CD Key) that was used to install the operating system.