Irq steering becomes disabled when installing USB port

[Delilena]

I need help! I just purcahsed an Acer 640BU scanner and am having problems making it work.Acer told me that in order for the scanner to work I need my Usb steering enabled, the only problem is that whenever I install the Usb port it disables my Irq steering.I have a Tyan s1590 m\b Via chipset and Award Bios on Windows 98.I've gone into cmos and enabled"assign Irq for Usb", but the only way the Irq steering is enabled is when I remove the Usb port.I think the Usb hub may have something to do with this problem.Can anybody please help me?:Q