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If you didn't use the original CD to install on the new computer, there might be a service pack issue. If you are trying to use a key from Windows XP Pro SP1 on a Windows XP Pro SP2 installation, it won't work.
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If you didn't use the original CD to install on the new computer, there might be a service pack issue. If you are trying to use a key from Windows XP Pro SP1 on a Windows XP Pro SP2 installation, it won't work.

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The computer is a DELL and the one I'm trying to install it on is HP.<br />
<br />
But, if my Dell is destroyed (hardware included) then there is no OS on the computer. I just want to know if the copy of Windows can only be licensed to that one computer (DELL) or should I be able to install on another..?
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The computer is a DELL and the one I'm trying to install it on is HP.

But, if my Dell is destroyed (hardware included) then there is no OS on the computer. I just want to know if the copy of Windows can only be licensed to that one computer (DELL) or should I be able to install on another..?

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OEM licences cannot legally be moved to new hardware 
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OEM licences cannot legally be moved to new hardware

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I have a Microsoft Windows XP Professional Certificate of Authenticity (COA) label attached to my computer, which is broken. I want to install Windows XP Professional on another computer, but the &quot;Activate Windows&quot; window is not accepting the serial number on the certificate..<br />
<br />
Am I not allowed to install it on another computer?
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I have a Microsoft Windows XP Professional Certificate of Authenticity (COA) label attached to my computer, which is broken. I want to install Windows XP Professional on another computer, but the "Activate Windows" window is not accepting the serial number on the certificate..

Am I not allowed to install it on another computer?

Windows XP Pro - not accepting my serial number..?

Microsoft Windows XP is the sixth release of the NT series of operating systems, and was the first to be marketed in a variety of editions: XP Home and XP Professional, designed for business and power users. The advanced features in XP Professional are generally disabled in Home Edition, but are there and can be activated. There were two 64-bit editions, an embedded edition and a tablet edition.