wmp 10....

how come wmp 10 always overrides my dvd player??..i have windvd4 installed and i set that as my dvd player default....but whenever i pop a dvd in my dvd drive a window pops up and says what program i want to open it with....i choose windvd....but instead wmp 10 pops up and starts to play the dvd....i go to the settings in wmp 10 and uncheck the dvd box....then close it then when i open wmp 10 again its checked again....why does it keep overriding the dvd as the default??..
 
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