Problem with erasing stuff

[space5]

Well, when I write any text in microsoft word 2003 I am getting really strangh problem, when I would like to delete let say a word, so I select it, the beckround of the word becomes blue and the text becomes white as usuall, but when I press delete on the button that is placed above the enter "usually there is an arrow on this button" it doesnt delete me the word. To delete a whole word only the "Delete" button works beside the End and Insert. And when I want to paste a new text instead of the old text, I select the old text than I press Ctrl+V and the computer does'nt erase me the old text and it just put the new text beside.

Examples:

"Today is a nice day" I want to change nice to bad and that what it gives me ->

"Today is a nicebad day"

By the way I am having this problem only with Microsoft Word and even after I reinstalled the whole office.

[spacesurfer]

Go to Tools --> Options --> Edit tab. Under editing options, check to enable "Typing replaces selection".

Done.