Card Reader problem

I installed a new Diablotek D15-3644 Multi-card reader in my new computer w/ an ASUS M4A78T-E motherboard running Windows XP Pro and SP/3. The computer recognizes the drives but will not read the cards when plugged in unless the cards are plugged in when the computer is booted up. These drives are supposed to be plug and play and no additional drivers are supposed to be installed. Checking the drivers they are the old 7-1-2001Microsoft drivers 5.1.2535.0. Thanks in advance for your help.