Code error problems in my sound card

hi i am a music freak. i like music and i heard from my friend that an external sound card creates much better sounds than built in sound card. i am not sure actually. ok this is not the problem the problem is i bought a new sound card for my computer and attached it in sound slot. i also installed sound drivers. but i cant not play file for an error. the error is given
Code 0x00000044
really confused about this error. now please remove my confusion giving me perfect solutions. advance thnx.
