Text Selector/Insertion Point icon disappears

Why does the text insertion point icon disappear whenever it is on top of
words when I am in Microsoft Word? This occurred after I tried to change
“schemes� in Mouse Properties. The text select/insertion point was so small
and difficult to see in the “Windows Aero� system scheme, I wanted to change
the visual appearance of the mouse. But when I tried to change the scheme
to “Magnified� or “Aero Extra Large�, or go to Ease of Access and go to “Make
the mouse easier to use� – the result of those actions is the same – the
mouse disappears. When I changed it back to the DIFFICULT TO SEE "Windows
Aero" I could see it again, but barely, because it is so small! I have
Windows Vista Home Premium 2006. I am running it on a Dell Inspiron 9400,
Intel® Core ™2 CPU laptop.
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Foo needs help