You have a Geo-Blocked Product Key installed.
Is there a COA sticker on the case of oyur machine?
Is it for Windows XP Pro?
If the answer to both questions is 'Yes', then you can download the Windows XP Product Key Update Tool from here.
<cite class="_Rm">go.microsoft.com/fwlink/?LinkId=50346&clcid=0x409</cite>
run the tool and on request enter the Key from the COA sticker.