I'm a newbie, and did look for the above problem in FAQs, but no luck.
I suspect that I've received a macro/virus in a file which had "links",
-which were not on my machine.
Having opened it, when working on other files I lost the ability to create graphs.
The wizard is greyed.
I read on the net that sharing could be the cause, but have tried stoppping shares with no improvement.
My windows and office 2003 security measures are up-to-date.
My work-around is to save the sheets as DOS or Excel 2.1, but some sheets I use have vital properties
which would be lost, and I cannot easily rebuild them.