microphone picking up systemsounds

I have a mic problem where the mircophone line acts as a output line like a
speaker, u can record the mic and u will hear system sounds (mp3 music,
gaming sounds) but not my voice. i have tried 2 soundcards and two headsets,
formated 2 times.

I think thats vista thinks it has a 7.1 speaker setup so it made the mic
line to an outline.

it worked 3 weeks ago.

tried setting everything in vista. Havent tried setting anything in the
registry dont know what to set.

if anyone know how to fix this please leave a message

specs
Windows vista 64x
motherboard gigabyte GA-EP35-DS3 newest bios
soundblaster creative audigy se and also tried the onboard sound from realtek