This is caused by an IRQ or DMA channel that is in conflict.  

Open the Device Manager (Win 95) or the Control Panel -> Drivers (Win 3.1) 
to change the Resources of the sound card to find a combination that works. 

Different systems have different hardware and configurations.  Because of
this, we cannot tell you which settings will work for yours, but it is easy to
change them, and a simple reboot will tell you if it worked.