I am using Excel 2000

I have recently opened a file sent to me, and since closing it my Edit menu does not work properly when I open any existing files or start a new file

The problem is with Copy, Cut Paste and Paste Special, when I click on the Edit menu they are all greyed out, also if I right click they are also greyed out

Obviously the file I opened has changed some settings, how do I re-set this

Thx in advance for any help

Paul