San disk card reader not working on Windows 7 Ultimate 32-Bit on HP Pavillion DV6 3004 TU - Plz Help

It is the San Disk Card adaptor in which I plugged my Sandisk Mobile Ultra Micro SD card. The Micro Sd is card as well as the adaptor is working on the Dell Laptop but not working on my HP system. I am facing this issue after I reinstalled the OS. So suspecting issue with the driver.