Copy and paste disbled in windows 2000

I haven't seen that on WIN2K yet, but I used to fix it on WIN9X PCs by reinstalling DCOM that can be found on the Microsoft website and elsewhere. Here is one source. Perhaps you can run the cfg file. http://www.merz-sw.com/products/dcom.php3

You also might try installing SP4 and see if that fixes it.

Is it disabled in your word, powerpoint and excel? If yes, you have a macro virus. Delete it by pressing alt F11 and erasing it. Save the clean file. close your microsoft application.
Go to start-up directory and delete the word, powerpoint and excel files.

I had the same thing. It was a virus. I think it was blaster. I got fixblast from symantec and it fixed the problem.