Office 2007 officially only supports Windows XP SP2 or higher, but there is a way to run it on Windows XP SP1.
1.Install Service Pack 2
2.Install Office 2007
3.Uninstall Service Pack 2
Then you can run Office 2007 on Windows XP SP1
When I enter the Office 2003 key, I get an error as shown in the picture above. You also entered the key correctly. The operating system is Windows XP SP2.