1. Next time you use a swear word, and disguise it with asterisks I'll delete your thread immediately.
2. If, as you say, the Office 2000 Pro files are on the computer already, how did they get there? It can only be because you installed them from the CD which you say you can't find, and if you can't find it there's nothing that any of us can do.
The problem has been caused by your installation of Windows 2000, and you've probably made things worse by 'borrowing' an Office XP CD and attempting to upgrade an already malfunctioning installation. If you don't have the properly licenced software there's absolutely nothing you can do, you'll have to find the CD that you've lost.