sound hardware

i have just upgraded my sons pc with my old m/b and XP1600 and have done a fresh install of win98se but when i start up i get new hardware found (mpu401) which is to do with the sound but when i try to install the driver from either the sound card driver disk or win98se it says it cannot find it! can anybody tell me where i can get it from?

thanks!!

The MPU401 is the soundcards external MIDI interface (when you plug like MIDI keyboards into your Soundcard)!

Whats the soundcard ... or motherboard that the soundcards on?

the motherboard is a Jetway V266B and the sound card is a Hercules Muse Lt 16bit surroundsound

I've also tried the on-board sound and the same happens?