I have an NEC GT200 with 500MHZ K-6 2 .My PC has its video and sounds cards integrated on to the motherboard. I have just bought a Diamond Stealth III S540 PCI. I have installed it physically and it works but so is the SIS 530 on the motherboard. Then windows 98 wants to install a second monitor. How can I disable the SIS 530? I have tried deleting it from the hardware profile, but windows installs it again. And when I do delete it the Stealth III stops working. What can I do???