Thank you for this. It is all OK now.

If you have time, would you mind sharing what you did to fix it. That could help future users of the forum.

Because I have a vast number of documents in my PC, each one has its address written in using a macro called prax(). I also frequently add dates to documents.

I don't know, now, what I did but on the ribbon the option INSERT > Date and Time went missing. The "Insert" was there but not the date and time option.

Following Charles Kenyon's suggestion I went to my templates which are at

C:\Documents and settings\(My Name)\Application data\Microsoft\templates

and I renamed the existing Normal templates as NormalOld. I did not rub these out because I needed to recover the macro prax().

I then went to a folder and created a new document. This has the effect of creating a new Normal file which, by the way, has the Insert > date and time option there.

Finally by opening NormalOld I could go Developer > Macros and copy the macro prax and paste it into my new Normal.

( I still don't know what I did to lose the Insert > Date and Time but what the hell ? It is all good again )