direct x does not want me to use firefox :'(

Yesterday I was installing the directX sdk update because I needed it to compile something (I can't talk about that because is privileged information by the moment), and after it finished, I opened visual C again, tried to compile again, and it gave me another problem... Then I tried to open an .htm file which was inside a folder... and surprise!! I got internet explorer in front of me.
What's this horrendous show? what has occured to my computer?? arghh!! yes... it seems like if you install directX it sets internet explorer to be your default browser. Kind of stupid idea!
Maybe it was because I didn't want to validate my windows license when downloading the sdk update - that's the price you have to pay!! haha!