Problem: Unable to activate Windows XP using the correct activation code. I have a Dell desktop originally supplied with Windows XP Pro (2001, prior to SP-1 or SP-2). The original CDs are long gone. I have created an Unattended Install disk slipstreamed with SP-2 using the CD for another system and it installs XP Pro perfectly. The old Dell has a sticker proving the Windows XP is legal and legitimate, but this activation code will not work with the slipstreamed disk. I have phoned Microsoft attempting to activate using the legitimate activation code, but they refuse to activate using that code and tell me I have to call Dell. Of course when I call Dell, they tell me I have to call Microsoft. I have legally-purchased licenses for my software and I would prefer to use the correct codes, but Microsoft seems dead-set on stopping me. Any advice?