Soundblaster gives blue screen of death please help

I bought a soundblaster because I got this system second hand and it didn't have sound for some reason although I checked and it has onboard sound in the bios. I installed the soundblaster and ran the software for it.. no problem so far. The sound worked fine and I played with it a bit..even downloaded an mp3 and it played fine.
The problems started a few minutes later when I realized the computer was running really sluggishly. I run a gateway 566mhz Celeron with 60 mgs of ram. I went online because i wanted to see if maybe there was some info on the soundblaster site. The computer suddenly froze and brought up a blue screen of death. I tried to reboot.. defrag.. etc.. but the problem didn't get fixed that way. I tried to remove the soundblaster on a whim to see if that was the problem and it was... the freezing and slowing down stopped and the system ran fine. I tried to install the card on a different slot.. in fact i tried them all with no success.. The sound works fine but my system goes on the fritz and eventually gives me a blue screen error each time.. I am running windows98se by the way. I am willing to give any more info if that might help lead to a solution.. just post the info you need. I wondered if maybe it was that i had to disable the onboard sound which i am unsure how to do. I did manage to find out that i can get to the bios by changing a jumper on the motherboard but there was no way i saw to disable it and a friend of mine said it should probably disable the onboard sound automatically. I am pretty frustrated at this point and am willing to try about anything. I would also be willing to just use the onboard sound if i could get it to work without all these problems. Thanks in advance if anyone has any clues on fixing my problem.