Hamsterball_Z, which OS are you running?
Because if you are running Windows 98SE, the only TBSC drivers that will work under that OS is the obsolete VxD driver (which has severe compatibility problems with DirectX 8.x). And with drivers for the newest graphics cards requiring DirectX 8 or higher just to even function at all (using those newest graphics cards under DirectX 7 will permanently lock your resolution at 640x480, your color depth at 4-bit/16-color mode and your monitor's refresh rate at 60Hz unless you upgrade your DirectX to a later version), and the VxD drivers working correctly only with DirectX 7, you'll have to downgrade your graphics card just to use the TBSC under Win98(SE).
As for installing Windows 2000 (or Windows XP), installing those OSes with ACPI disabled in the BIOS will also disable all bus mastering. I learned that after my initial installation of Windows XP - my HD's transfer mode was permanently fixed at the slowest PIO transfer mode, which (literally) used all of the CPU's processing power just to access data on the hard drive. And none of my graphics cards will work correctly with busmastering disabled, to boot - graphics will show strange artifacts, especially in 3D games. Thus, you should install those OSes with ACPI enabled in the BIOS, and then disable ACPI after you have those OSes up and running.
(BTW, that IRQ sharing with ACPI enabled in Windows 2000/XP occurs mostly with Intel-brand motherboards; it may or may not occur with other brands of motherboards.)