Cursor Blinks/flickers During Games

this has been bothering me forever,
whenever i open a game,

ex: madden 07, age of empires, cs:source...etc

my mouse flickers/blinks when i move it.

when i dont move my cursor, i cant see anything
but when i do move my mouse, the cursor on the
screen flickers and it looks like theres a little square
around it when i move it.


this only happens during games
and nothing happens when im doing stuff outside of games


PLEASE HELP!!!

thanks