hello, recently I noticed that the sd card is not visible in "my computer". when I take it out and in again, there is the windows sound of the inserting but still it is not visible. when I looked in hardware manager the sd card controller has the yellow triangle with ! in it, like the driver is bad. tried to update the driver from the drivers list here in the forum but wont let it and saying that the best driver is already installed. any suggestions? thanks.