Windows 7: USB Card Reader Problem

Hi there, I hope i posted on the correct tab ^_^

anyway I have bought a new all-in-one card reader to read my MMC and MicroSD.
upon buying it, they tested it over their test area, and it worked. when I got home, it doesn't work. it just keeps on blinking, computer detects the hardware, but not the card itself. I tried it on other computers and laptops and it reads in just a snap.



So what could be the problem of my PC that it won't read my card reader?