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Are you sure you don't have a pci slot? Almost every motherboard has them. More likely there are not drivers that are 64 buy and/or support beyond win xp.
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I have a DIO2496, bought in about 1999, and it uses the same Windows 7 driver. Works great except for one bug whereby when using optical input you have to click "select optical" twice in the control panel (i.e. switch it off, then on again). I actually gave away a barebones PC I'd inadvertently bought without a PCI slot, as I wanted to retain the 2496.