I am not able to read my 2.0 gb card

Hello,

I am not able to read the contents of my 2 gb card. The card reader is working properly but when inserted into the system along with the 2gb card, the memory card's contents are not displayed. When I go for the autoplay option I get the message - PLEASE INSERT A DISK IN THE DRIVE - inspite of having a memory card in it. I have installed Windows XP in my system. The same card reader is working perfectly with a 1 GB card. I even tried updating USB driver but I didnt get the desired result. Please help me.