Assuming you work with Windows XP:
1. Control Panel
2. date, Time, language and Regional..
3. add other languages
5. key settings - choose Polish (Programmers)
6. add - it should put the icon in your task bar
7. click Language bar next to key settings to see if the adding of the icon to the task bar is checked.
It should work. Then type as usual. When you come to a letter that you want it to have a little "thingy" press Alt and your regular font.
press Alt and your regular font.
Correction: press Ctrl & Alt at the same time and then the font ć,ś,dż,ź etc