Start | Control Panel | Regional and Language Options | In keyboards and languages Tab
In Install / uninstall languages Button
* Only you can change the language version of Windows Vista Ultimate.
Otherwise will need a new installation of the system with the desired language.
> Follow the documentation:
This was too quick as I did't have time finish my question. I bought a laptop in Portugal and the DOS system's portuguese, which is normal. But I want ito change it to English as I can guess what the windows show but not all the time. I went to control panal and changed it to English but the prompts or warning still come up in Portuguese.