I've been surfing the net to find a solution to my product key problem but still haven't found one. The hints I find don't solve the problem. I have an XP Pro installation CD with SP3 included. As such it used to work just fine. I then slipstreamed SATA drivers into it using the most recent version of nlite (1.4.9.1). I did not remove nor insert anything else. I just created an ISO image. When using the resulting bootable CD on my laptop (not connected to a network at the time) it used a SATA driver nicely and was able to access the hard drive but the installation no longer accepted my product key. Instead I immediately got Error: The Product Id you entered is not valid. I ran the nlite session on another XP Pro (with SP2) to begin with in the belief I would not see this problem!! Any more hints? LAST SESSION.INI