Language support in Windows can be altered by Control Panel, Keyboard, Language tab, provided your Windows has Multilanguage Support installed.
To install Multilanguage Support, use Control Panel, Add/Remove programs, Windows Setup tab. Have your Windows CD in the drive, put a check in the box, and click the Apply button.
You probably don't want a French or Spanish computer. If you just want to type a special character now and again, use the Character Map under System Programs. Highlight the character you want, click the select button to put it in the 'to copy' box, click the copy button to put them into the Clipboard for later pasting into your document.
Cheers, PW.