Upgrading from usb 1 0 to 2 0

I want to upgrade from usb 1.0 ports/drivers to 2.0 on my desktop which has Windows XP service pack 3. When I go to microsoft.com it tells me that 2.0 was included in SP1 however the drivers USBEHCI, USBOHCI are not there and MS will not download SP1 because I have SP3. My question is, if I go out and buy a USB 2.0 PC-card will it still not work without those two drivers, which I cannot find anywhere (that don't have spyware attached to them)? If so, where can I get these two drivers? If I don't need those drivers will any USB 2.0 PC card work or do I need a specific one (other than getting two slots which my Compaq has side by side front and stacked in back)? Thanks - Roger
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