Experiment with this (It's a setting in windows, not in Excel):
Right-click on any empty space in *windows desktop* > choose Properties
Select Appearance tab* > click "Item" dropdown menu > choose "Tooltip"
Choose and apply the font color (just to the right of the "Font:" box)
to *match* that of the fill color (just to the right of the "Item:" box)
The font will then become "invisible" in the hyperlinks in Excel
But note that this is also the default setting for comment boxes as well,
so you won't be able to see the text inside comment boxes created
unless you change the font color for individual comment boxes
to that of a "non-matching" color
*If in WinXP, click "Advanced" at the Appearance tab (an additional step)