I have vista 64 and when I play the game the sound lag, like when I am shooting sometime it take like a second before the sound play. And when I takes items on the ground the game stop for a split second.

Check your sound configuration in the setup.exe. I think SoundBlaster Pro is what dosbox emulates. Check too that you have IRQ 7 selected.

I'm wondering too,I'm having the same problems and this solution didn't work for me.

it may actually be a lag between the dosbox emulated card and directsound in windows sending it to the card. if you have a older xp system or a loaded windows system the software emulation will be slow. on a modern system there should not be any lag unless you have major disk activity or cpu hitting 100%

Also try lower 'Sound Acceleration' in Menu Start -> Settings -> Control Panel -> Audio/Music Devices -> Volume -> Speakers settings -> Advanced -> Performance in Windows XP.