PRODUCT
Office 2000 Small Business Edition
O/S: Xp Home Edition, v. 5.1, serv. pack 2
Br: Inernet Explorer 7

The undo/redo buttons are grayed out in the toolbar and in the Edit menu
"can't undo" is grayed out. This started at some point in the past without my
noticing it or being aware of any particular action that I took that would
cause this. This is now the constant state of Excel when opening a new
spreadsheet or on any previously created spreadsheets. When copying such an
affected spreadsheet to a different computer Excel behaves normal with undo
available as usual. I have removed Office 2000 and reinstalled from CD and
same condition remains. I want to mention one other odd occurrence that
started at the same time in case there is a connection: the dialog boxes in
the drop down menus lost their gray background. The entry fields and buttons
are now displayed on an opaque white background.

Other conditions on my PC: I have a Visio button in the toolbar that I
thought may cause this condition and I removed Visio from my PC but button
remains after re-installing Office 2000 and I can't delete it. Also, I have
Visio button in Word and it doesn't interfere with Undo from Word Edit menu.
I wonder if there is a Registry entry that causes this?

Thank you for any help anyone can supply.