Maybe it can be useful for someone;
To install multilanguage support for Windows
Open the Add/Remove Programs dialog box. At the Windows Setup tab,
Click Multilanguage Support, and then click Details.
Make sure a check mark appears beside the language or languages you want to use.
Click OK, and then click OK again.
The changes take effect after your computer restarts.
~Note
You can use Windows to create documents in many different languages. However,
to create documents in a Central European-, Cyrillic-, Baltic-, Greek-,
or Turkish-based language, your must install multilanguage support.
>To change the keyboard layout for an installed keyboard language
Go to control panel and open the Keyboard Properties dialog box. Click the Language tab.
Click the Add button to select the keyboard layout you want to use, and then click OK.
There is also a selection box on the language keyboard dialog box that lets you choose
to switch between keyboard language settings.
This is very handy!!
You may want to download a Turkish font pack but I think most of these
work with the fonts provided in Windows.
Once you have done this, when you switch to your Turkish keyboard layout the keys are set
up basically the same but now......
[ = g
] = ü
{ = G
} = Ü
; = s
' = i
, = ö
. = ç
etc...