Problem entering tonos and writing in Greek Keyboard

Description of the problem:

By switching to the Greek language the keyboard will not enter Greek characters unless I press the SHIFT key. Then I can normally type Greek characters until I try to enter a vowel with tonos. When I press the ; key (next to L) the keyboard stops again and I have to press SHIFT again to type greek characters. Furthermore, no characters (vowels) with tones are entered.

The desktop PC used is a HP Compaq DC7700 with Windows XP Professional in Greek language.

Can somebody help?

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