無法安裝w7 7127 - Windows

我現在是用xp sp2

今天用酒精、DAEMON
掛載w7 7127光碟後會跳出
this installation disc isn't compatible with your version of Windows.
To up grade, you need the correct installation disc.
For more information, check your computer's system information.
To install a new copy of windows, restart your computer using the
installation disc, and then select custom.

這樣的錯誤訊息
似乎是不能用升級的了
只能用重灌

請問是那一版的xp才可以直接用升級的??

還是說得vista才可以用升級的??

還是說本來就不能用升級~一定得重灌@@"

謝謝

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