hello everyone. first time here so i hope this is the right forum.

my question may be a easy one. i have vista home premium,and windows dvd maker apears to not be working. everytime i try and "ADD VIDEO" it says video type not supported. it used to run fine but now no matter what video format i use it says "not supported" i know that under the options tag there should be a "compatibility mode tab" but there isnt. please help. ~~ANDY