lots of noise

we use here a md player to set sound files to the pc but the last days we get lots of noise in the sound.

we found we have to reboot the pc to solve the problem for a while but it always comes back and we are getting agrovated.

we always use automatic gain control and u tryed noise reduction.

but its still very crackling...

and its sometime in the red.

i dont think that wavepad is the trouble maker but i dont know what it is...

so please help me!

thnx in advance