MS Word Error

I have an P4 PC having OS Windows XP. I have installed Office XP Prof. Later I have uninstalled Office XP and tried to Install Office 2000 Prof. All the Installation is going well without any errors. After the installation when I am trying to open the Mircosoft Word it was not opening and giving a message, (I didn’t read that message),like Send the report of Don’t Send. And all the Other Applications like Excel, Powerpoint, Access were opening. I had tried by installing MSOFFICE 4 time. But no change.
Please give me a Suggestion
Thanx