From what you have said, is that your PC is USB 1.1 compliant and you have a USB 2.0 card reader.
You can install a PCI USB 2.0 card, and this will enable you to run your USB card reader in USB 2.0 mode.
You can get one
click here for about £30
or type usb 2.0 into google
You must have a spare PCI slot free on your motherboard.