Odds on it's this:-
MS Article found at
http://support.microsoft.com/default.aspx?scid=kb;en-ca;Q320531OFF: Changes
to Fill Color and Fill Pattern Are Not Displayed
The information in this article applies to:
Microsoft Excel 2000
Microsoft Excel 2002
Microsoft PowerPoint 2002
Microsoft Publisher 2002
Microsoft Word 2002
Microsoft PowerPoint 2000
Microsoft Publisher 2000
Microsoft Word 2000
This article was previously published under Q320531
SYMPTOMS
When you try to change the fill color or the fill pattern in one of the
programs listed at the beginning of this article, the changes that you
selected may not be visible; however, you may be able to see the changes in
print preview and on a printed page.
CAUSE
This issue may occur if the Use High Contrast check box is selected.
RESOLUTION
To resolve this issue, follow these steps.
NOTE: Because there are several versions of Microsoft Windows, the following
steps may be different on your computer. If they are, see your product
documentation to complete these steps.
Click Start, click Control Panel, and then click Accessibility Options.
Click the Display tab, and then click to clear the Use High Contrast check
box.
Click OK to close the Accessibility Options dialog box.
MORE INFORMATION
High contrast color schemes make the screen easier to view by heightening
screen contrast with alternative color combinations. Some of these schemes
also change the font sizes for easier reading.
